ST2,2+ Users Manual

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2. 2 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) This page intentionally left blank

59. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 59 This page intentionally left blank.

50. 50 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 3 : Circuit Board Schematics Steri - Trac 2/ 2+ Interface Circuit Board

1. Document #: CM - 500 - A - 3 .00 © ChemDAQ ® Inc. 201 9 , All Rights Reserved Steri - Trac 2 / 2 + Gas Monitoring System User’s Manual ® ®

60. 60 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) ChemDAQ ® Inc. www.ChemDAQ.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide) 300 Business Center Dr. Suite 330 Pittsburgh, PA 15205 USA

21. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 21 4. A Detailed Guide to the Area Monitor Menu Operations Passcode To protect configuration settings from unauthorized tampering, the PASSCODE screen appears whenever MENU is selected on the main screen. Until the user sets up a passcode, simply press ENTER on the ENTER PASSCODE screen to proceed to the MENU. Setting /Changing the Passcode To activate the PASSCODE feature or to change the current passcode , press the MENU button on the main display to bring up the ENTER PASSCODE screen shown above . Press CHANGE and follow the prompts. (You will need to enter the current passcode to create a new one.) Be sure to write down your new passcode and keep it in a safe place! To deactivate the PASSCODE feature , press CHANGE. When prompt ed to enter the new passcode, simply press ENTER. (Again, you will be required to ente r the current passcode to implement this change.) Entering the Passcode Once you have setup your passcode, simply enter the code and press ENTER. Use the DELETE key to erase input errors. Pressing CANCEL returns you to the Home Display . Remember, if no pas scode has been set, simply press ENTER to proceed to the menu system.

38. 38 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) 3. Planning Cable routing : Some installations require signal - cable routing , such as cable routing from Area Monitor to Remote Display, or from Area Monitor relay contacts to an external device. When planning for cable - routing, the following options are available. • C able can be routed into the Area Monitor through the 1 .5 ” (3.5cm) cutout in the back panel (A, below) . If desired, the Area Monitor / Remote Display can mount directly to a 4x4 electrical box recessed in the wall as shown in C. The unit’s mounting - hole pattern will work with most standard electrical boxes, but verify your box is compatible before installing. • Or cable can be routed through the optional cable grips (B) installed on some units. Note: For customers supplying their own signal cable between Area Monitor s and Remote Displays, use CAT 5 or CAT 6 twisted pair instrumentation cable. [Instructions continued next page.] A B Cable Routing Options for Area Monitor / Remote Display Area Monitor mounted to 4x4 electrical box (profile). C

3. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 3 Safety and Legal Notices THIS MANUAL MUST BE CAREFULLY READ BY ALL INDIVIDUALS WHO HAVE OR WILL HAVE THE RESPONSIBILITY FOR INSTALLING, USING , OR SERVICING THIS PRODUCT. LIKE ANY PIECE OF COMPLEX EQUIPMENT, THIS PRODUCT WILL PERFORM AS DESIGNED ONLY IF INSTALLED, USED AND SERVICED IN ACCORDANCE WITH THE MANUFACTURER'S INSTRUCTIONS. OTHERWISE, IT COULD FAIL TO PERFORM AS DESIGNED AND PERSONS WHO RELY ON THIS PRODUCT FOR THEIR SAFETY COULD SUSTAIN SEVERE PERSONAL INJURY OR DEATH. The warranties made by ChemDAQ Incorporated in the Standard Terms and Conditions with respect to these products are voided if the products are not installed, used and serv iced in accordance with the instructions in this manual. Please protect yourself and others by following them. Call or e - mail ChemDAQ technical support for all questions regarding use or repairs . Information in this document is subject to change without no tice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical for a ny purpose without express permission of ChemDAQ Inc. ChemDAQ has patents or pending patent applications, trademarks , copyrights and other intellectual property rights covering the subject matter in this document. The furnishing of this document does not give you license to these patents, trademarks, copyrights, or other intellectual property except as expressly provided in any written license agreement from ChemDAQ Inc. See ChemDAQ’s Standard Terms and Conditions for Warranty Information. Available at www.Chemdaq.com ChemDAQ Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 / Local: 412.787.0202 x310 ChemDAQ Incorporated 300 Business Center Dr. Suite 330 Pittsburgh, PA 15205 , USA ©ChemDAQ ® Inc. 201 9 , All Rights Reserved This manual was created by the technical writing services of Checkerspot Studio LLC. www.CheckerspotStudio.com 7/ 19 / 2019 Bluetooth ® and logo are trademarks of the Bluetooth Special Interest Group (SIG) . Velcro ® is a trademark of the Velcro Companies.

14. 14 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) The External Power Adapter The Steri - Trac 2/ 2 + Area Monitor requires 5VDC power which is supplied by an external power adapter included with your system. The ada pter plugs into a standard AC outlet and has a 10 - foot cord ( 3m ). The Remote Display require s the power adapter when configured for wireless communication. Like the Remote Display, the Sensor requires a power adapter when configured for wireless communic ation. It will use a power adapter with a mini - USB connecto r, included in your system if required . The default power adapter s are suitable for use with type A and B outlets. Adaptors for other outlets are available on request. The Steri - Trac 2/2+ components were designed to be powered by the +5V DC switching power supply shipped with your system . Utilizing a different power supply may cause damage to the unit. If an additional power supply is required, please contact ChemDAQ. +5 VDC Power Adapt er All Area Monitors require a power adapter . Any Remote Display or Sensor communicating wirelessly with the Area Monitor also require a power adapter. The power adapters shown below have been included with your system. Components Requiring a Power Adapter Mini - USB Power Adapter

42. 42 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) D. Installing the Sensor 1. Before proceeding, make sure you have reviewed the Sensor placement guidelines beginning on p. 34 . 2. The Sensor will be seated in the Sensor C radle shown below. The Cradle may be wall - mounted or adhered to a horizontal surface. a. For w all - mounting, use the wall - anchors and screws included with your system. (See A below.) b. For mounting to a horizontal surface, use the enclosed Velcro strips to adh ere the Cradle to the surface. (See B below.) Note: The Sensor Cradle is a vital part of your ChemDAQ system. Sensor s are precision instruments and can be rendered inoperable by impact - damage. The Cradle will protect the unit from being dropped or bumped from its station . Install with care. A. Wall - Mounted Sensor Module B. Horizontal Surface Adhesive Velcro - Type Strips Sensor Cradle Mounting hardware shown is included with your system

55. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 55 Manually Res e t ting the Area Monitor or Remote Display In the unlikely event the Area Monitor or Remote Display software freezes, the units come with a master reset switch. Indications that the software has frozen: The unit will not respond to the Sensor; will not respond to touchscreen inputs; the Heartbeat i ndicator is not blinking (see p. 17 ); the clock is not advancin g etc. Attempting to reboot the unit by unplugging it from external power and plugging it back in again will not work immediately ; the battery back - up circuitry will keep the unit powered for over an hour . The fastest way to perform a master reset is via the reset switch. Resetting the Area Monitor / Remote Display: 1. Make sure the unit is plugged into electrical power. (For Remote Displays connected via cable to the Area Monitor, make sure the cable is connected and the Area Monitor is powered on.) 2. I nsert a paper clip or similar device into the access port located on the bottom of the housing and dep ress the reset button inside. (See figure below.) The Area Monitor / Remote Display will perform a master reset and should begin to function normally again.

40. 40 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) 2. Use a #2 Phillips Head Screwdriver to remove the four screws securing the front and back shells of the Area Monitor h ousing. Use caution when separating the front and back panel . A ribbon cable connects the two shells. 3. To fully separate the front and back panel, c arefully unplug the ribbon cable (A, below) from the back panel (wall - side panel ). For no w, set the front panel aside on a clean, nonabrasive surface to prevent scratching the display. 4. If you intend to route cables through the back panel , remove the plastic plug from the round cutout (B, above) . If the Area Monitor is to be installed directly to a recessed electrical box as explained on p. 38 , mount the back panel to the electrical box at this time. Use the mounting screws t hat came with the electrical box. Double - check the panel is oriented so the cable connectors are on the bottom. ( See illustration on next page . ) You may then skip to step # 7 . Front A B

32. 32 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) 5. A Guide to the Remote Display’s Touchscreen Interface For a general overview of the Remote Display’s function, refer to p. 13 . Home Display The appearance and function of the Remote Display’s Home Display is identical to that of the Area Monitor ’s . Refer to the Home Display guide which begins on p. 16 . In t he event of an alarm, you may silence the Remote Display’s alarm horn by touching the field on the Home Display showing the alarm state, that is, the digits displayed in yellow or red. Silencing a Remote Display’s alarm horn will NOT silence the Area Moni tor. Remote Display Menu System Accessing and navigating the Remote Display’s menu system works the same way as that of the Area Monitor’s. Pressing MENU on the Home Display will bring up the Passcode screen etc. ( Refer to the Menu guide starting on p. 19 .) The list of menu selections is limited to functions which apply to the Remote Display only. The Menu options for the Remote Display are: Alarms, Bluetooth, and Display. Alarms: Menu Path: Menu > [Passcode] > Alarms The Remote Display ALARMS m enu allows you to configure the alarm horn’s VOLUME and RE - ALARM time. The interface is identical to the Area Monitor’s. See p. 25 for instructions. Display Menu Path: Menu > [Passcode] > Display The DISPLAY m enu allows you to choose what information is displayed in each field on the Home Display . The interface is identical to the Area Monitor’s. See p. 29 for instructions. [See next page for BLUETOOTH Menu selection.]

29. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 29 Other Bluetooth Wireless Settings Pressing INFORMATION on the Bluetooth Interface will display the device name and Bluetooth ID of the internal Bluetooth module . Press EDIT DEVICE NAME to customize the name of the connected Sensor M o dule or Remote Display as it will appear on the device li st. D ate and Time Menu Path: Menu > [Passcode] > Date and Time When setting the Date and Time, the date format is: Year - Month - Day. For T ime , u se the 24 - hour clock format . It’s important to set DATE AND TIME correctly so that the data - logging feature will assign the correct time - stamp to the collected data. Local date and time will have to be set manually in those regions of the world where the clocks change with the season. Display Menu Path: Menu > [Passcode] > Display Here is where you select the type of readings which will appear in the MAIN DIGITS field as well as the two SUB DIGITS fields on the Home Display . (See figure below, as well as the explanation on p. 16 .) The user can choose a REAL - TIME VALUES to appear in the field or TIME - WEIGHTED AVERAGE (TWA) readings. See p. 24 for an ex planation of TWA readings. Main Digits Sub Digits 1 Sub Digits 2 Home Display, showing the three fields configurable in the Display Options Interface.

47. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 47 Summary of ACK and LATCH Settings This table summarizes how the LATCH and ACKNOWLEDGE settings in the Alarm Interfa ce affect the Area Monitor ’s alarm indications. (See p. 23 ) Acknowledge On ACK  Acknowledge Off ACK  Latch ON Latch  Anyone can manually silence (ACKNOWLEDGE) the alarm - horn, even if the gas concentration is above the alarm setpoint. If no one manually silences the alarm - horn, it will continue to sound, even after gas concentrations have dropped below the alarm - setpoint. Horn is LATCHED ON until manually silenced. Manually s ilencing the alarm - horn requires entering the passcode. If no one manually silences the alarm - horn, the alarm - horn will continue to sound, even after gas concentrations have dropped below the alarm - setpoint. Horn is LATCHED ON until manually silenced. Latch OFF Latch  Anyone can manually silence the alarm - horn, even if the gas concentration is above the alarm setpoint. If no one manually silences the alarm - horn, the horn will automatically turn off when the gas falls below the alarm setpoint. DEFAULT SETTING Manually silencing the alarm - horn requires entering the passcode. If no one manually silences the alarm - horn, the horn will automatically turn off when the gas falls below the alarm setpoint.

7. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 7 1 . Welcome to the Steri - Trac 2/ 2 + Gas Monitoring System Welcome from ChemDAQ ChemDAQ Inc. designs, manufactures and sells gas detection systems for occupational safety to diverse markets such as healthcare, medical device manufacturing , and the food and beverage industries. We provide comprehensive solutio ns fo r continuous monitorin g, including a rea m onitor ing , personal monitoring, and data recording — all backed by ChemDAQ’s full technical support. ChemDAQ’s flagship Steri - Trac line has provided customers with a dependabl e a rea m onitor ing system for over a decade. Now we are proud to introduce the next generation model , t he Steri - Trac 2 and 2 + Area Monitor ing System s . The Steri - Trac 2/2+ Area Monitor is available in several configurations: It can be wall - mounted as shown on p. 9 . It can be equipped with a Flexible Wall Mount (See A, below) or with a Sterilizer Stand (B). Contact ChemDAQ for details. Steri - Trac 2 E - Cell Sensor Steri - Trac 2/ 2+ Area Monitor A B

33. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 33 Bluetooth Menu Path: Menu > [Passcode] > Bluetooth The Remote Display’s Bluetooth screen is shown on the right. Each menu option is explained below. Pressing REMOTE DISPLAY CONNECTION activates the internal Bluetooth module. This readies the Remote Display for wireless communication with the Area Monitor. (W hen the wireless module is activated, the following status message will be displayed , “BT is setup for Remote Display Connection , ” as shown in the illustration.) Pressing DISABLE turns the wireless module OFF. This must be selected when the Remote Display is connected via cable to the Area Monitor. When wireless is disabled, the status message will read “BT service is off.” Caution: If the Remote Display is connected to the Area Monitor via signal cable, the Remote Display’s Bluetooth module MUST be OFF (D ISABLED). Otherwise, erratic behavior and/or incorrect readings at the Remote Display will result. Pressing INFORMATION will display the Remote Display’s DEVICE NAME and Bluetooth address. Press EDIT DEVICE NAME to assign a different DEVICE NAME to the Remote Display. Use the virtual keyboard to enter the new name. Note: To permanently save the new DEVICE NAME, you must press INITIAL to reinitialize the Bluetooth module . Explanation of DEVI CE NAME: The Remote Display’s DEVICE NAME serves as a unique identifier to distinguish it from other Bluetooth - enabled devices nearby. When an Area Monitor attempts to establish wireless communications, it will scan the area and display the DEVICE NAME S of all detected Bluetooth devices. The user will then select the Remote Display from that list . ( See p. 28 .) Configuring a Remote Display for Wireless Communication To prepare a Remote Display for wireless communication, navigate to the Bluetooth Screen (M enu > [Passcode] > Bluetoot h) and do the following : 1. In the BLUETOOTH screen (shown above), press INFORMATION. Jot down Remote Display’s DEVICE NAME shown in the information screen. This is how you will identify the Remote Display when the Area Monitor scans and lists all local Bluetooth devices. (If you wis h to change the device name, see EDIT DEVICE NAME above.) Press BACK to exit INFORMATION screen. 2. Press REMOTE DISPLAY CONNECTION in the BLUETOOTH SCREEN (shown above) to enable Remote Display’s wireless module. Verify the status message on the screen now reads “BT is setup for Remote Display Connection.” 3. Proceed to the Area Monitor and refer to the Bluetooth - connection instructions on p. 28 .

34. 34 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) 6 . System Installati on Instructions A. Determining Component Placement Note: The following instructions assume the user will wall - mount the system components. ChemDAQ offers other options, however. Monitors equipped with Flexible Wall Mounts (A, in figure below) or Sterilizer St ands (B) are available as alternatives. Contact ChemDAQ for details. 1. Sensor Placement When determining the optimal location for placing the Sensor , several factors to be considered are listed below. • T he Sensor will be seated in the Sensor Cradle shown below. The cradle should be mounted to a vibration - free surface, either wall - mounted using wall - anchors and screws (included) , o r fixed to a horizontal surface, such as the top of a free - standing sterilizer, using Velcro ® - type adhesive strips (also included ). • Distance: Position the Sensor as close as possible to any potential gas leak / source . It’s important to understand that the Sensor is not designed to detect ‘from a d istance.’ Rather, the unit will only detect gas that reache s the Sensor cell through air movement and diffusion. Thus, the closer the Sensor is to a leak, the sooner the gas will reach the Sensor cell. ChemDAQ recommends placing the Sensor no more than five feet ( 1.5m ) from the gas - source . A B Sensor Cradle With Sensor Installed

31. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 31 Data Logging Menu Path: Menu > [Passcode] > Data Logging Use the DATA LOGGING SCREEN (Steri - Trac 2+ only) to download data onto a USB memory stick . The Monitor writes the data in CSV format which can be imported to a spreadsheet program such as Microsoft Excel ® . (Consu lt the HELP section of your spreadsheet app for instructions on importing data files .) To download data, unscrew the cap covering the USB port as shown below. I nsert a USB memory stick into the data port . The USB stick must be formatted in FAT or FAT32. O nce connected, the Onboard Memory I con (shown below) turns GREEN . Then: • To d ownload ALL data stored in the Monitor : Press ALL. Then press BACK to return to the HOME SCREEN. OR • To download data collected within a specific date range, adjust the START DATE and END DATE using the arrow buttons. ( The START DATE and END DATE are in “Year, Month, Day” format. ) Then press SEND to export the data to the stick. Press BACK to return to the HOME SCREEN. The Onboard Memory icon (see figure below) will turn or blink red while the Area Monitor is writing the data. To avoid data corruption, do NOT remove the USB device until the icon turns GREEN . The export process may take a few minutes if a large amount of data was requested. When writing data to the memory sti ck, the Area Monitor will first create a folder named after its serial number. Example: Area Monitor #AM190401 - 11 will create a folder named AM190401.11. If that folder already exists, the Monitor will write to the existing folder. In the folder, the Monit or will create a separate CSV file for each DAY in the selected date - range. The name of each day - file is an eight - digit date code. Example: File 20190401.csv contains logging data for April 01, 2019. When opened in a spreadsheet program, each row of data b egins with a date and time stamp. (A row beginning with 20190402, 150126 contains data for April 2, 2019, recorded at 15:01:26, or 3:01pm.) There are nineteen data fields in each row, including the Monitor’s parts - per - million readout (or percentage readout if applicable) and the status of each alarm. See p. 57 for a full list of data parameters . Onboard Memory Icon USB Port Front View Side View Cap

9. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 9 2. Th e Steri - Trac 2/ 2 + System Components Overview This section provides a more detailed explanation of the main components of the Steri - Trac 2/ 2 + Gas Monitoring System and covers the following topics: • Sample System Installation • The Steri - Trac 2/2 + Area Monitor • Steri - Trac 2 vs. 2+ Features • The Steri - Trac 2 Remote Display • The E - Cell Sensor • External Power Adapter • System Configuration Options Sample Installation Shown below is a sample installation of the Steri - Trac 2/ 2 + Area Monitor ing System , illustrating the function of each component . The Area Monitor (A) , mounted in a chemical storage room, displays the gas concentrations detected by the E - Cell Sensor (B) . The Remote Display (C) , which mimics the Area Monitor ’s visual display and aud ible alerts, is mounted outside the room by the entrance door. The Monitor sends data to the Remote Display wirelessly or via signal cable. This allow workers to view the status of the Area Monitor before entering the potentially hazardous area. A B C

43. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 43 3. If the Sensor will connect to the Area Monitor via USB cable (included with your system), follow the instructions below. For wireless communication, proceed to the Config uration instructions beginning on p. 44 . 4. The Sensor USB cable is shown below. The large connector ( type USB - A) will plug into the Area Monitor . The smaller connector ( type USB mini - B) will plug into the Sensor . a. Plug the USB - A connecter into the Area Monitor port as shown ( See A below) . Note: Do not twist the USB connector. Insert straight in. Secure the connection by lightly twist ing the locking ring clockwise. b. Plug the mini - B USB connector into the Sensor the same way . Gently tighten the locking ring. 5. Insert the Sensor into the Cradle. The button on the backside of the Sensor slides between the two tabs on the Cradle as shown below (C) . 6. Use the enclosed cable - ties and adhesive mounts to bundle excess cable and power cords. Carefully stow them out of the way to avoid snagging or tripping hazards. This concludes the hardware installation instructions. Proceed now to t he next page for instructions on configuring your Area Monitor for the first time. A B USB Communications Cable 6’ (2 m) Rear view of Sensor and Cradle C Button Tabs

20. 20 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) • BLUETOOTH : For Bluetooth wireless communication, here is where you configure the Area Monito r to connect to a Sensor or a Remote Displa y . (See page 28 .) • DATE AND TIME : Here is where you set the local date and time. (See p. 29 . ) It’s important to set DATE AND TIME correctly so that any data - logging features will assign the correct time - stamp for each data - point recorded . Local date and time will have to be re set manually in those regions of the world where the clocks change with the season. • DISPLAY : Here is where you select the kind of data that will be displayed in the MAIN DIGITS field as well as the two SUB DIGITS fields. (See p. 16 for explanation of displays.) For each field, the user can choose to display INSTANTEOUS readings or TIME - WEIGHTED AVERAGE (TWA) readings. (See p. 29 for detailed inst ructions.) • ZEROING : When first connected to an Area Monitor, some Sensors require baseline adjust ment , a procedure called ZEROING. See the instructions shipped with your Sensor. Please read the instructions on p. 30 before ZEROING your Sensor. Improper use can compromise its accuracy. • ALTITUDE: The Altitude Screen is where you enter the local elevation in feet - above - sea - level. Important: To ensure accurate readings at the Area Monitor, the local altitude must be set correctly. See p. 27 for instructions. • BACK TO MAIN: Pressing this option will return you to the Home Display .

12. 12 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) To power - on the Sensor, simply press and hold the Power - Button for about five seconds, until the CAL LED turns on. To manually turn off the unit, press and hold the Power Button until the Cal LED turns off. When the Sensor is powered - on, t he Power Button LED Ring indicates the Sensor battery’s charge through a series of flashes. The number of flashes in each series indicates its percentage charge. ( Example: A series of five flashes indicates 50% charge; six flashes indicate 60% charge ; 10 flashes indicate 100% charge etc.) The internal batteries automatically recharge when connected to external power. (Batteries are not user - replaceable.) Note: The battery charge indicator is not operative when the Sensor is using Bluetooth wireless to communicate with the Area Monitor. The LED R ing will flash irregularly and cannot be used to determine battery charge. Included with your ChemDAQ system is a Sensor Cradle which holds the Sensor securely in place, wherever it’s mounted . Because the Cradle can be wall - mounted or adhered to a horizontal surface the Cradle can be installed in nearly any location. Mounting hardware has also been included with your system . Mounting instructions are found on p. 42 . Power - Button LED Ring: When illuminated, unit is powered ON. Blinking indicates % battery charge. (5 blinks = 50%, 10 blinks = 100%) Cal LED: Illuminates when unit is powered . Green = Within Calibration Period Yellow = Calibration Overdue Red = Calibration Overdue (Urgent) Sensor ID Ring Examples Orange = ETO Light Blue = H 2 O 2 Brown = PAA (See full list on p. 46 ) Sensor Cradle

41. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 41 5. H old the back panel against the wall - surface, where the unit will be mounted . Verify the unit is level and oriented so the electrical connectors are on the bottom. Mark the four drill - holes with a pencil. See figure below. Set the unit aside when finished. 6. Drill the mounting holes (¼” / 6.3mm bit) and insert the wall - anchors. Then secure the back panel to the wall using the four mounting - screws . Again, mak e sure it’s oriented so the external electrical connectors are on the bottom edge. 7. At this time, make any cable connections to the unit’s internal circuit boards. ( Example: Connections to the Remote Display terminals, the relay contacts etc.) You will find circuit board schematics and wiring information on p p. 50 – 51 . For Electrical Safety: All external wiring must be performed by qualified personnel, with NO power applied. Before wiring to the Area Monitor ’s Internal Relays , please review the contact r atings on p. 56 . 8. If your monitoring system involves interconnecting units, such as an Area Monitor wired to one or more Remote Displays, mount the other units at this time and perform all cable connections before proceeding. 9. Reassemble the Area Monitor housing by carefully reconnecting the ribbon cable to the circuit board. (See A on previous page.) The connector is keyed to ensure correct orientation. Fit the front and back shells of the Area Monitor together and secure with the four Phillips Head screws. (Refer to #2 on p. 40 .) Correct Orientation of Area Monitor Connectors on bottom edge Mounting holes Mounting holes

54. 54 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Remote Display If an error message appears on BOTH the Area Monitor and the Remote Display, refer to the Area Monitor Troubleshooting Table. (p. 52 ) Problem Cause Resolution No Comm. Error Message Remote Display is not receiving data from the Area Monitor.  This message will appear on the Remote Display when ever the user enters the menu system of the Area Monitor. Communications will resume normally when Monitor has returned to the Home Display .  For cable - connected Remote Displays, verify signal cables are wired correctly. (See p. 51 for wiring chart.)  For Remote Displays communicating wirelessly, go to Area Monitor and configure Bluetooth connection. (See p. 28 ) Remote Display is behaving erratically, displaying erroneous data. Remote Display’s Bluetooth Module is turned ON while connected via cable to Area Monitor. If the Remote Display is cable - connected to the Area Monitor, verify the Remote Display’s Bluetooth Module is DISABLED. See p. 33 . Remote Display screen is dark . Unit is not getting power.  For cable - connected Remote Displays, power is received from Area Monitor: Verify the Area Monitor is powered on. Also, verify cable connections are secure and correct. (See p. 51 )  For Remote Displays communicating wirelessly, verify the power adapte r is connected to a working electrical outlet. (See p. 14 ) “Heartbeat” Indicator is not flashing. (p. 17 ) The Remote Display software has frozen. See instructions for manually resetting the unit on p. 55 . Touchscreen interface is not responsive. ChemDAQ Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide)

37. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 37 • Visibility : The unit should be installed in a location that permits an unobscured view of the display , preferably at eye - level if practical. • Accessibility : Because the touchscreen interface is used for silencing alarms , periodically installing calibrated Sensor s , and configuring the system , make sure the unit is easily accessible. • Protection from Collision / Dropping: The units should not be located where they are prone to collision damage from, for example, swinging doors , utility carts etc. • Bluetooth Wireless Range: See note on wireless range on p. 35 . • Electrical Out let: All Area Monitor s require an external power adapter (included with your system) which plugs into a local electrical outlet. A Remote Display communicating with the Area Monitor wirelessly also uses the power adaptor, requiring a local outlet. (See p. 14 ) The cord length of the power adapter is 10 feet. (3m.) • Important Note Regarding Classified Areas : Do NOT install Steri - Trac 2/ 2+ components in Classified Areas, as defined by USA - OSHA or similar national/state governmental bodies for occupational safety . For such applications, please contact ChemDAQ for information on its Intrinsically Safe line of Area Monitor s and Sensor s. WARNING: A Classifie d Area (as per OSHA Standard 29CFR, §1910.307) is one where flammable or combustible concentration of hazardous chemicals are likely to be present. Mounting NON - Intrinsically Safe electrical components in a Classified Area poses a FIRE and/or EXPLOSION HAZ ARD , possibly resulting in serious injury or loss of life. [Instructions continued next page.]

17. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 17 [Guide to Hom e Display Continued.] D) ChemDAQ Logo / “Heartbeat” Feature: During normal operation, the ChemDAQ logo will blink intermittently. This “heartbeat” feature indicates the software is running properly. In the unlikely event the logo is not blinking, the Monitor’s software has frozen. Refer to the troubleshooting table on p. 52 . E) The G as - T ype B eing M onitored. This field is user - configurable. (See p. 28 . ) In the above example, ethylene oxide (ETO) has been selected . If the Area Monitor is mistakenly connected to a Sensor of a different gas - type, the Monitor will cease normal operation and di splay a WRONG SENSOR error message. To correct the error, the user must install a Sensor of the correct gas - type or reconfigure the Area Monitor for the new Sensor . (See p. 28 . ) F ) Battery Charge Indicator : This displays the percent - charge of the Area Monitor ’s internal, rechargeable battery which keeps the Monitor running during power outages. The battery is not user - replaceable. G ) Location: This user - configurab le field contains a short description of the location being monitored. In the example above, the Area Monitor is displaying data from the Sensor located at “Sterilizer 2.” See p. 27 for instructions on how to configure this field. H ) Date and Time. See p. 29 for instructions on h ow to configure this field. It’s important to set date and time correctly when the system is installed so that any data - logging features will assign the correct time - stamp to collected data. Local date and time will have to be reset manually in those regio ns of the world where the clocks change with the season. D E F G H I K J

49. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 49 For Sensors Connected via Bluetooth Wireless (A detailed explanation of the Bluetooth interface begins on p. 28 .) 1. Disconnect the o ld Sensor by d oing the f ollowing: a. Remove the old Sensor from the Sensor Cradle by lifting the Sensor straight up. (A) b. POWER OFF the Sensor by pressing and holding the POWER BUTTON until the LED turns off. (The NO SENSOR message will be displayed on the Area Monitor until the new Sensor is installed.) c. Unplug the Power Adapter (C) from th e Sensor by gently twisting the locking ring counterclockwise and pulling the connector straight out. 2. Install the new Sensor by doing the following: a. Connect the Power Adapter (C): Insert connector and gently tighten locking ring. b. POWER ON the new Sensor b y pressing and holding the POWER BUTTON for about five seconds, until the LED illuminates. c. At the Area Monitor, access the Bluetooth Interface. (MENU > [Passcode]>Bluetooth) d. In the Bluetooth screen, press SENSOR CONNECTION ( D ) . The Area Monitor will now scan for Bluetooth devices within range and will list their serial numbers and/or device name s o n the display. Your new Sensor will be listed by its serial number. If the serial number does not appear, press RESCAN. e. Once you hav e found the new Sensor’s serial number on the list, use the virtual keypad to select it. (If the Sensor is #3 on the list, press 3 on the keypad.) Follow the prompts. f. When communications are established, p ress BACK to return to the Home Display . The Area M onitor might display a “No Sensor” message temporarily . This will clear within a few seconds after system updating is complete . g. Set the Sensor in the Sensor Cradle ( E ) . The button on the back the Sensor slides between the tabs on the Cradle. h. WAIT AT LEAST TWO MINUTES BEFORE ZEROING. 3. ZERO the new Sensor by following the ZEROING instructions found on p. 30 . 4. Package the old Sensors and RETURN THEM TO CHEMDAQ . Instructions, packing material, and a return - shipping label is provided for your convenience. A Power Button LED C D E

48. 48 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 2: Sensor Exchange Instructions As part of ChemDAQ’s S ensor Exchange Program , the customer will periodically receive a set of calibrated Sensors, usually every four months, depending on the Sensor - type. The customer will install the new Sensors and ship the old ones back to ChemDAQ. For convenience , ChemDAQ provides instructions a s well as a pre - paid shipping label for returning the old Sensors. Sensor installation is simple and requires no tools. When installing a new Sensor as part of ChemDAQ’s Sensor Exchange Program (SXP), follow the instructions included with the shipment of Sensors . The SXP instructions will contain the most up - to - date procedures as well as any special instructions that apply to each Sensor - type. O 2 (Oxygen) Sensors require special consideration. Please refer to the instructions shipped with the O 2 Sensor when installing and/or zeroing. Please install Sensors promptly - the same day or the day after receiving them. If the Sens or s were shipped during very cold or very hot weather conditions, let them sit overnight at room temperature before installing. For Cable - Connected Sensors ( See next page for Sensors connected via Bluetooth wireless. ) 1. Disconnect the old Sensor by doing t he following : a. Remove the old Sensor from the Sensor Cradle by lifting the Sensor straight up. (A) b. POWER OFF the Sensor by pressing and holding the POWER BUTTON until the LED turns off. (The NO SENSOR message will be displayed on the Area Monitor until the new Sensor is installed.) c. Unplug the USB cable from the Sensor by turning the connector’s locking ring counterclockwise. Then pull out the connector (B) . 2. Install the new Sensor by doing the following: a. Connect the USB cable by inserting into the USB por t of the new Sensor. Secure by gently tightening the locking ring. b. POWER ON the new Sensor by pressing and holding the POWER BUTTON for about five seconds, until the LED illuminates. c. Set the Sensor in the Sensor Cradle. The button on the back the Sensor sl ides between the tabs on the Cradle. (C) d. WAIT AT LEAST TWO MINUTES BEFORE ZEROING. 3. ZERO the new Sensor by following the ZEROING instructions found on p. 30 . 4. Packag e the old Sensors and return them to ChemDAQ. Instructions, packing material, and a return - shipping label is provided for your convenience. A B C Power Button LED

16. 16 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) 3. Overview of Area Monitor ’s Touchscreen Interface The Home Display This section identifies and explains each field shown on the Area Monitor ’s Home Display . It also contains page references to more detailed instructions. A) Main Digits B) Sub - Digits 1 C) Sub - Digits 2 The Main Digit and the Sub - Digit fields are user - configurable. Each field can display the REAL - TIME value of the target gas concentration or a time - weighted average (TWA) based on minutes or hours. In the example above, the Main Digits (A) show the REAL - TIME value of the target gas in parts - per - million (ppm). The Sub - Digits 1 (B) displays the 8 - hour time - weighted average (TWA), and the Sub Digits 2 (C) displays a 15 - minute TWA. For an explanation of the TWA values, see p. 24 . To configure what each field displays, see p. 29 . During normal operation, the REAL - TIME and TWA digits are GREEN . In the event of an alarm condition, t he digits in the affected field will change color . YELLOW = Instantaneous Low Alarm. RED = Instantaneous High Alarm . (See p p. 22 + for an explanation of the alarm system.) Silencing the Alarm Horn: To silence the alarm horn , simply touch the field on the main display that is highlighted YELLOW or RED . If the alarm - silence function has been passcode protected, the Are a Monitor will prompt you to enter the passcode. This will silence the Monitor’s horn only. Remote Display’s must be silenced individually. A C B

39. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 39 B. Installation Kit and Tools Required 1. Installation Kit Your system has been shipped with an installation kit which includes: #10 1 - inch (2.5cm) S crews and W all A nchors * Velcro - T ype Adhesive Strips 4 - inch (10cm) Cable Ties Cable - tie M ount with A dhesive B ack *Note: The wall anchors supplied are designed for hollow walls and plaster walls. For other wall - types, the installer may supply his own mounting hardware if needed . 2. Tools Required : Drill with ¼” (6.3mm) bit Level #2 Phi ll ips Head Screwdriver s Hammer Ma rking pencil If making cable connections to monitor’s internal circuit board, you will need the following electrical tools : Wire stripper/cutter Small flat tip screwdriver (≤ 1/8 inch/ 3.2mm blade) C. Mounting Instructions for Area Monitor / Remote Display The following instructions apply to both the Area Monitor and the Remote Display units . For brevity, only the Area Monitor will be referenced. 1. Before drilling holes, please double - check the following : a. You have reviewed the Component Placement guide lines beginning on p. 36 . b. Area Monitor s and Remote Display s are nearly identical in appearance , so c heck the label s to make sure you’re mounting the correct component. Look for the words “ Area Monitor ” or “ Remote Display ” as shown below.

45. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 45 2. Configure the Area Monitor using the MENU System. a. When the Area Monitor is powered on for the first time, you will be prompted to enter your user - information. This step must be completed to unlock the Monitor’s functio nality.  Press and Hold MENU on Home Display until Passcode Screen appears. Press ENTER.  In the MENU Display (shown below) press USER INFO.  Enter user data in the first - four fields. Refer to p. 27 for instructions.  When finished, press BACK to return to Menu Display. b. Continue configuring the Area Monitor by customizing the options listed below. Page references will take you to pertinent instructions. Each item below is found in the Menu Display is accessed by p ress ing MENU on the Home Display . ( For passcode, simply press ENTER until you h ave implemented the passcode option . ) c. Configuration Options:  Set the correct SENSOR TYPE . See p. 28  Set correct DATE AND TIME. See p. 29  The alarm - settings for your Area Monitor are set at the default values for each gas - type. Use the ALARMS interface to view or customize alarm settings. ( See p p. 22 +)  Set ALTITUDE. See p. 27 .  Use the ZEROING function to establi sh your Sensor ’s baseline. Refer to p. 30  Use the DISPLAY interface to customize how values are displayed on the Home Display . See p. 29 .  If you have wired into the Area Monitor ’s mechanical relays, use the RELAYS Interface to configure. See p. 26 .  If desired, create a passcode to limit access to Area Monitor ’s MENU system. See p. 21 . (Note: By default, the Area Monitor ’s alarm horn can be silenced WITHOUT entering the passcode. To restrict who can silence the alarm - horn, set alarms to NOT Acknowledgeable. See p 23 .) Menu Display

25. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 25 [Setting Time - Weighted Average Alarm Parameters, continued] Hour or Minute Setpoint: Here you set the time - period used in the TWA calculation. In the example above, an 8 - hour time - window has been selected. To change the value, first choose CUSTOM using the virtual selector. Tap the – and + dials to adjust the value . The Minute Setpoint range is 01 to 59. The Hour Setpoint range is 01 to 24. Gas Concentration Setpoint (Parts - Per - Million or % in the case of O 2 and LEL Sensors ) : The Gas Concentration SETPOINT is the gas concentration ( averaged over the time - period selected) which triggers the TWA A larm. In the example above, 1.0ppm has been selected. Whenever the Area Monitor has determined the average exposure level for the last eight hours has reached or exceeded 1.0ppm, it will activate the TWA Alarm indications. To change the SETPOINTS, move the slider from DEFAULT to CUSTOM. Then tap the – and + dials to adjust. Re - Alarm Time Menu Path: Menu > [Passcode] > Alarms > Re - Alarm Time The default value for the Re - Alarm Time is 15 minutes. That means, if the alarm - horn is ma nually silence d during an alarm condition , the horn will sound again in 15 minutes, assuming gas levels remain at or above the alarm threshold . Use the Re - Alarm Time interface to modify how long the horn is silenced. If 00 is selected for the Re - Alarm Tim e , the horn will reactivate immediately (i.e. if the gas concentration exceeds the alarm threshold). Even when the horn has been silenced, the Area Monitor will remain in alarm condition as long as gas levels are at or above the alarm threshold. This means the display will continue to show an alarm condition and the relay contacts, if so configured, will remain in their alarm state . RE - ALARM TIME and ALARM VOLUME adjustments at the Monitor do NOT affect Remote Display settings. Remote Displays must be adjusted individually. Alarm Volume Menu Path: Menu > [Passcode] > Alarms > Horn Volume Use the Alarm Volume Interface to adjust the volume of the alarm horn. OFF will disable the horn. Hour or Minute Setpoint Gas Concentration Setpoint (ppm)

26. 26 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Alarm Test Menu Path Menu > [Passcode] > Alarms >Test Pressing and holding the TEST button does the following: The Monitor’s alarm horn sounds (continual tone) at maximum volume. The two relays and the 4 - 20mA outp uts switch to their alarm condition. When the button is released, the horn, the relays, and 4 - 20mA outputs revert to their normal condition. Note: The ALARM TEST activates the horn of the local unit only. Other Area Monitors or Remote Displays must be test ed/adjusted independently. Relays Menu Path: Menu > [Passcode] > Relays > Re lay 1 Settings [ OR Relay 2 Settings] The Steri - Trac 2/ 2+ Area Monitor features two mechanical relays located on the interface circuit board. (See schematic p. 50 . ) Using the Relay Interface shown below, the user can select what condition will activate each relay. There is a separate interface for Relay 1 and for Relay 2 . In the example below, the user has configured Relay 1 to be activated in the event of a High Alarm. While a relay’s “ trigger condition ” is set through the software interface, the Normally Open (NO) or Normally Closed ( NC) option is selected by wiring to the NO or NC terminals on the circuit board. Refer to the schematic on p. 50 . Before wiring or configuring the relays, see p. 56 for contact ratings. As shown above, you may select one of the following trigger conditions for each relay: High Alarm: The relay is activated in the event of a High Alarm. The High Alarm is based on instantaneous readings. (See p. 22 . ) Low Alarm: The relay is activated in the event of a Low Alarm. The Low Alarm is based on instantaneous readings. (See p. 22 . ) TWA - Minute: The relay is activated when the TWA - Minute threshold is reached or exceeded. (See p. 24 . ) TWA - Hour: The relay is activated when the TWA - Hour threshold is reached or exceeded. (See p. 24 . ) No Sensor: The relay is activated when the Area Monitor cannot communicate with its Sensor . Note regarding Alarm Conditions: If a relay is configured to activate in response to an alarm condition (i.e. high alarm, low alarm, or TWA alarm), the relay will remain in its alarm condition even if the alarm horn is manually silenced. The relay will revert to its “normal” condition on ce gas levels have dropped below the alarm threshold.

4. 4 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Safety Notices Important Safety Notice Regarding Configurable Alarm Settings The Steri - Trac gas monitor is designed to provide state of the art protection for employees using hazardous chemicals with visual and audible alarms based on instantaneous gas concentration and time - weighted - average ( TWA ) concentrations. These alarms are fully configurable : The alarm thresholds can be adjusted or disabled; the alarm response (e.g. latching and re - arming) and the horn volume (high, medium, low and off) are fully configurable . The default values for the targ et gas are pre - set in the monitor when delivered from ChemDAQ. ChemDAQ recommends keeping the alarms at the default values or at values that reflect user's national standards, if different. While the default alarms and alarm horn can be disabled, such conf igurations are not recommended, and user assumes all responsibility for using the monitor so configured. Important Notes to Installer / Operator • The Steri - Trac 2 /2+ Area Monitor and Remote Display were designed to be powered by the + 5V switching power su pply shipped with the unit. Utilizing a power supply other than this device is not recommended and may cause damage to the unit. If an additional power supply is required, please contact ChemDAQ. • For Electrical Safety: All external wiring must be performe d by qualified personnel only, with no power applied . • For Electrical Safety: Before wiring to the Area Monitor ’s Internal Relays , please review the contact ratings : Resistive Load: 0.4A @ 125 VAC; 3 A @ 30 VDC. Inductive Load: 0.2A @ 125 VAC; 2 A @ 30 VDC Maximum switching current: 3 amps • The Steri - Trac 2/ 2+ Sensor, Area Monitor, and Remote Display do NOT contain user - replaceable batteries . ChemDAQ ® Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide) ChemDAQ ® Incorporated 300 Business Center Dr . Suite 330 Pittsburgh, PA 15205 USA

36. 36 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) • Electrical Outlet ( Wireless Communication Only): A Sensor communicating over Bluetooth wireless requires the external power adapter (included with your system) which plugs into a local electrical outlet . The cord length of the adapter is ten feet ( 3m ) . (A Sensor connected by USB cable receives power from the Area Monitor . No external adapter is needed .) • Importa nt Note Regarding Classified Areas : Do NOT install Steri - Trac 2/ 2 + components in Classified Areas, as defined by USA - OSHA or similar national/state governmental bodies for occupational safety . For such applications, please contact ChemDAQ for information on its Intrinsically Safe line of Area Monitor s and Sensor s . WARNING : A Classified Area (as per OSHA Standard 29CFR, §191 0.307) is one where flammable or combustible concentration of hazardous chemicals are likely to be present. Mounting NON - Intrinsically Safe electrical components in a Classified Area poses a FIRE and/or EXPLOSION HAZARD , possibly resulting in serious injur y or loss of life. 2. Gas Monitor Placement / Remote Display Placement When determining the optimal location for installing the Area Monitor or the Remote Display , several factors should be considered. If your Area Monitor is equipped with a factory - installed Sterilizer S tand (A) , use the guidelines below to find a suitable, flat surface to place the Monitor. References to wall - mounting do not apply. • Secure Mounting Surface: Both the Area Monitor and the Remote Display are wall - mounted and should be installed on a secure, vibrat ion - free surface. • Water or Chemical Spray: The units are not designed for wet environments. Make sure the y are not exposed to moisture from water or chemical sprays. For applications in wet environments, contact ChemDAQ for information on its line of water - resistant monitoring system. A

22. 22 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Alarms Menu Path: Menu > [Passcode] > Alarms The ALARMS interface allows you to configure the Area Monitor ’s instantaneous and the time - weighted average alarms. This section of the manual will explain the different alarm types and how to configure them. The ALARM interface cannot be accessed while the Area Monitor is in alarm. Important Safety Notice: The Steri - Trac 2/2+ gas monitor is designed to provide state of the art protection for employees using hazardous chemicals with visual and audible alarms based on instantaneous gas concentration and TWA concentrations. These alarms are fully configurable : The alarm thresholds can be adjusted or disabled; the alarm r esponse (e.g. latching and re - arming) and the horn volume (high, medium, low and off) are fully configurable . The default values for the target gas are pre - set in the monitor when delivered from ChemDAQ. ChemDAQ recommends keeping the alarms at the default values or at values that reflect the user's national standards, if different. While the default alarms and alarm horn can be disabled, such configurations are not recommended, and user assumes all responsibility for using the monitor so configured. Instantaneous Alarms The Steri - Trac 2/ 2 + Area Monitor has two configurable INSTANTANEOUS ALARMS: A Low Alarm and a High Alarm. (The terms LOW and HIGH refer to gas concentration levels, not horn volume.) Instantaneous alarms are based on the CURRENT gas le vels detected by the Sensor . The alarm is triggered as soon the detected gas concentration reach es the alarm SETPOINT . Example: Note the sample Alarm Interface , shown on the next page, which displays the default INSTANTANEOUS ALARM settings for Hydrogen Peroxide: 5.0ppm for the LOW ALARM and 2 0.0ppm for the HIGH ALARM . If detected levels reach the 5.0ppm SETPOINT , the Area Monitor will immediately go into the LOW ALARM condition : The Digits change to yellow, and the horn will emit a loud, pulsating alert (Beep...Beep... Beep...) . If gas levels continue to rise to 2 0.0pp m , this will trigger the HIGH ALARM : T he Main Digits field will turn red, and the horn will emit a loud, continuous alert (Beeeeeep) .

15. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 15 Examples of System Configuration Shown below are some system - configuration options. In the default configuration (A) , t he Area Monitor communicates with the Sensor over a USB cable (included) . The Remote Display is connected to the Monitor via instrumentation cable which carries data as well as power to the Remote Display . Although the Steri - Trac 2/ 2+ requires only 5VDC power, the cable carries 15VDC to support earlier Steri - Trac mod els, if required. In example (B) , the Sensor is connected to the Area Monitor via USB cable. The cable carries data as well as 5VDC the Sensor requires . The Remote Display communicates wirelessly with the Area Monitor and thus requires a local outlet for the power adapter. As shown in example (C) , the Area Monitor can drive up to three Remote Displays via instrumentation cable . The cables will carry data as well as 15V DC . In this instance , the customer has chosen the wireless connection between the Area Monitor and the Sensor . Note: The Area Monitor can link wirelessly with only ONE device at a time, either a Sensor or a Remote Display. Remote Display Area Monitor Sensor A 1 5VDC Data Note: Enclosed USB cable is 6 feet (2m) long. Standard Configuration CAT 5 or CAT 6 twisted pair instrumentation cable USB 5VDC Remote Display Area Monitor Sensor B 5VDC 5VDC Data USB 3x Remote Displays Area Monitor Sensor C 5 VDC Data Data, Power

23. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 23 Setting Instantaneous Alarm Parameters Menu Path: Menu > [Passcode] > Alarms > Instantaneous Alarms Shown below is the Instantaneous Alarm Interface, followed by an explanation of each configuration option. On - Off Toggle Switch: When ON, the alarm is enabled. When OFF, the alarm has been disabled. Default - Custom Selector : When DEFAULT is selected, the a larm s ettings will revert to the factory defaults based on the gas - type of the Sensor . You will find a list of default alarm valu es on p. 46 . If you wish to customize any alarm parameters, you must slide the selector to CUSTOM. Latch: When LATCH is not checked (  as shown above ) , the Area Mo nitor will automatically silence its alarm - horn when gas levels drop below the alarm SETPOINT . When the LATCH checkbox is selected (  ) , however, the horn will continue to sound even after gas levels have dropped below the alarm SETPOINT . A LATCHED alarm can only be silenced manually at the touch screen. ACK (Acknowledgeable): When selected (  ), the alarm horn is ACKNOWLEDGEABLE, meaning it can be silenced from the Home Display . ( To silence the horn, simply touch the field on the Home Display representing the alarm. Fields in alarm display their digits in yellow or red.). When ACK is not selected (  ), silencing the alarm also requires the user to enter the passcode. The default se ttings for all gas - types is LATCH = NO and ACK = YES as shown above . This configuration is typical for most monitoring applications. Please consult the LATCH/ACK chart on p. 47 before changing these settings. Setpoint (in Parts - Per - Million or % in the case of O 2 and LEL Sensors) : The SETPOINT is the gas concentration threshold which triggers the alarm. In the example above, the LOW ALARM is triggered at 5.0ppm and above. The HIGH ALARM is triggered at 20.0ppm and above. To change the SETPOINTS, move the slider from DEFAULT to CUSTO M. Then tap the – and + dials to adjust the SETPOINTS . Regarding Setpoints The High Alarm value must be set HIGHER than the Low Alarm value. (E.g. If Low Alarm Setpoint = 5.0, then High Alarm must be ≥ 5.1.) Back: Once you have adjusted the alarm settings , press the BACK arrow to return to the previous screen . Any setting changes will automatically be saved when you return to the Home Display .

30. 30 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Zeroing Menu Path: Menu > [Passcode] > Zeroing Please read the important information in the shaded box below before using the Zeroing I nterface. Improper Zeroing can degrade the accuracy of the Sensor . Here is where the Sensor ZEROING function is performed. O 2 (Oxygen) Sensors require special consider ation. Please refer to the instructions shipped with the O 2 Sensor when installing and/or zeroing. When an electrochemical Sensor is employed in a new environment, it’s not unusual to see a minor offset in the zero - baseline reading. The Zeroing function co rrects the offset so the Area Monitor displays 0.0 or 0.00 ppm when no target - gas is present. Zeroing can also be used to correct minor baseline - drift on a Sensor already in service, but this should be done infrequently and only after it has been determined no target gas is present. As a safety feature, the Area Monitor allows only minor corrections to the baseline. The ZEROING I nterface (shown above) displays the S ensor ’s Name (i.e. gas - type) and its Serial Number . The Zero2 Value , which is stored in the Sensor ’s memory, is the adjustment - factor the Sensor uses to correct the baseline o ffset . Final PPM Reading is the corrected reading the Area Monitor will display , minus the decimal point. To Zero - Adjust a Sensor ’s baseline reading , simply press ZEROING. (See A, above.) Once the zeroing is complete, the Zero2 Value and the Final PPM Reading will be updated. Important Information Regarding the ZEROING Function: • When installing a new Sensor as part of ChemDAQ’s Sensor Exchange Program (SXP), follow the instructions included with the shipment of Sensors . The SXP instru ctions will contain the most up - to - date procedures as well as any special instructions that apply to each Sensor - type. • The Zeroing function should only be performed when in CLEAN AIR with NO target gas is present in the environment. • Most Sensors, once c onnected to the Area Monitor, require at least two minutes for the readings to stabilize. Zeroing should be performed only after the Sensor has settled. • Zeroing a Sensor is NO substitute for actual calibration. Zeroing only corrects minor shifts in the b aseline reading. A full calibration, which ChemDAQ performs as a part of its Sensor Exchange Program, requires the application of zero - gas and known concentrations of the target - gas to the Sensor. In addition, ChemDAQ runs each Sensor through a series of d iagnostic tests.

18. 18 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) [Guide to Home Display Continued.] I) Onboard Memory Icon: (Steri - Trac 2+ Monitor only) This icon (default color is GRAY) indicates the Monitor is equipped with onboard data storage. When a USB stick is inserted in the data port (shown as F on page 10 ) , the icon turns GREEN. While data is being downloaded to the stick, the icon blinks RED to indicate it is in read - write mode . To avoid data corruption, unplug the memory stick only when the icon is solid GREEN. Instructions for retrieving data are found on p. 3 1 . J ) Sens or Status: When a Sensor is connected to the Area Monitor , the Sensor’s serial number automatically appears in this field . Also displayed is its Calibration Status Indictor (65/180 in the example shown). The first number represents the number of days sinc e the Sensor was calibrated. The second number represents the Sensor ’s Calibration Interval plus 50%. In the example below, the Sensor has gone 65 days without calibration, and once it reaches 180 days without calibration, the unit will shut down . The Area Monitor will display “Cal Required.” This is a safety feature. An uncalibrated Sensor may not be working correctly and can induce a false sense of security. Note: Calibration interval varies by sensor type. If the Sensor Status is displayed in YELLOW or RED text , the Sensor is overdue for calibration. Please call ChemDAQ to verify that calibrated Sensor s have been shipped as per the ChemDAQ Sensor Exchange Program. The Sensor will shut down once it is 50% beyond its calibration due date . This is a safety feature. An uncalibrated Sensor may not be working correctly and can induce a false sense of security. ChemDAQ Technical Services TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1.412.787.0202 x310 (Worldwide) K ) Menu: Press the touchscreen here to enter the Monitor’s menu - system. (See p. 21 for guide to Menu system.) Days Since Sensor Calibration Sensor Shut - Down Day (Sensor’s Calibration Interval + 50%) Text Color Indicates Sensor’s Calibration Status: White : Within calibration interval. Yellow: Overdue for calibration. Red: Overdue for calibration, urgent. Sensor is near shutdown date. Guide to Sen sor Status Indicator Sensor Serial No.

44. 44 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) E. Initial Configuration of Monitor Software 1. Apply Power to the Area Monitor a. Connect the ChemDAQ - supplied 5V power adaptor to the Area Monitor and plug into an outlet. Any other components requiring external power (see p. 14 ) can be plugged in at this time. When first powered on, the Area Monitor may briefly display “ Please Go to Menu and Enter User Info... ” Ignore this message for now. You will update the User Info l ater. b. Power - on the Sensor by pressing and holding (for about five seconds) the Power Button until the Cal - LED (p. 11 ) turns on. c. If the Sensor is to communicate wirelessly with the Area Monitor , refer to p. 28 for i nstructions on configuring the devices for Bluetooth wireless. If the Area Monitor goes into alarm after being powered on, you can silence the horn by pressing the highlighted field on the touch screen. If the alarm is caused by elevated readings, it’s po ssible the Sensor needs a few minutes to settle. This is especially true if the Sensor sat in storage for an extended period prior to installation. HOWEVER: DO NOT OVERLOOK THE POSSIBILITY THE SENSOR IS RESPONDING TO HIGH LEVELS OF THE TARGET GAS! If WRONG SENSOR appears on the Area Monitor Display , this means the Area Monitor is programmed for a different Sensor type. (Example: The Monitor is set for an ETO Sensor but has been paired with an H 2 O 2 Sensor.) If your system has multiple Monitors of various gas - types, double - check you are pairing the correct Sensor to the Monitor. (Each Sensor - type has a color - coded ID - Ring. See p. 57 details.) If you need to reprogram the Sensor - type in the Area Monitor, do the following: P ress MENU on the touchscreen. For the passcode, simply press ENTER. Press SENSOR TYPE and select the correct gas - type for your Sensor . See p. 28 . If you need assistance Please call or email the ChemDAQ Technical Services Department : TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide) [Instructions continued next page.]

51. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 51 Cable Connections Note: For customers supplying their own signal cable between components , use CAT 5 or CAT 6 twisted pair instrumentation cable. Steri - Trac 2/ 2+ Area Monitor to Steri - Trac 2 Remote Display Steri - Trac 2/ 2+ Area Monitor Terminal Blocks J6, J7, J8 G G Steri - Trac 2 Remote Display Terminal Blocks J6, J7, J8 D - D - D+ D+ V+ V+ Steri - Trac 2/ 2+ Area Monitor to Steri - Trac 1 Remote Display Steri - Trac 2/ 2+ Area Monitor Terminal Blocks J6, J7, J8 G G ND Steri - Trac 1 Remote Display D - 485 In - D+ 485 In + V+ V+ Steri - Trac 2 /2 + Area Monitor to Steri - Trac 1 Sensor Module Steri - Trac 2/ 2+ Area Monitor Terminal Block J9 G G ND Steri - Trac 1 Sensor Module D - SENS - D+ SENS+ V+ V+

56. 56 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 5 : Component Specifications Environmental Operating Range The Steri - Trac 2/ 2 + system components are designed to operate within the following parameters . (Note: Operating range of Sensors may vary, depending on gas type. See next page for Sensor specifications.) Ambient Temperature : - 20 ° C to +50 ° C Relative Humidity : 10 to 95% RH - non - condensing Altitude : Maximum Altitude 10,000’ (3000 m), constant pressure Steri - Trac 2/ 2 + Area Monitor s Steri - Trac 2/ 2 + Area Monitor Manufacturer’s Part No .: 900 - 0024 User - Replaceable Batteries? No Maximum Current Draw: 680 mA Operational Duration of Backup Batteries (Rechargeable): ≥ 1 hour. Dimensions (w x h x d) : 8 ” x 6 ” x 2.5” ( 20.3cm x 15.2cm x 6.4cm ) Weight: 1.6 lbs. (725g) The ratings of internal relay contacts: Resistive Load: 0.4A @ 125 VAC ; 3 A @ 30 VDC Inductive Load: 0.2A @ 125 VAC ; 2 A @ 30 VDC Maximum switching current: 3 a mps Remote Display Manufacturer’s Part No. 900 - 0026 User - Replaceable Batteries? No Maximum Current Draw: 680 mA Operational Duration of Backup Batteries (Recharge able): ≥ 1 hour. Dimensions (w x h x d): 8” x 6” x 2.5” (20.3cm x 15.2cm x 6.4cm) Weight: 1.6 lbs. (725g) External Power Supply: ChemDAQ - Supplied 5V External Switcher Manufacturer’s Part No: 500 - 0016 ( External 5V supply ) and 660 - 0031 (cord) Power input: 100 to 240 VAC (50/60 Hz) Power Output: +5VDC Power Consumption: 3.5 Watts Temperature Range: - 20 ° C to +50 ° C

10. 10 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) The Steri - Trac 2/ 2+ Area Monitor The Area Monitor is the central component in the ChemDAQ system . The Monitor collects and displays real - time monitoring data received from the Sensor . It also has a fully configurable alarm system , allowing the user to define what gas concentration s will trigger an alarm, based on current levels or TWA’s (time - weighted averages) . The alarm horn volume may be adjuste d as well, even disabled for applications where the Monitor is not being used for safety applications . These options, and many others, a re selected through the touchscreen’s intuitive menu system. If gas concentrations reach alarm - level, the Area Monitor’s horn will sound and the relevant digits on the display will turn YELLOW or RED . The horn can be silenced by touching the field display ing the alarm, indicated by the yellow or red digits. (See table on p. 46 for a guide to all alarm indications.) Other features include: C onfigurable impending - ala rm system, two sets of mechanical relays (dry contacts) for interfacing with external devices, 4 to 20 mA output , Modbus etc. ), as well as the ability to communicate with the ChemDAQ Data Acquisition Computer. Steri - Trac 2 vs. 2+ In addition to the features above, the Steri - Trac 2+ has onboard memory for storing all monitoring data internally and a standard USB port (See F bel ow) for downloading the data (CSV format) onto a memory stick. See page 31 for full instruction. Steri - Trac ® 2/ 2 + Area Monitor External Port Identification A) Cable Port: Sensor Communications. B) Communications port. (Factory use only ) C) +5VDC Power Port. (See p. 14 .) A B C Standard port - configurations are shown. The Area Monitor also comes with a 1 .5 ” (3.8cm) cutout for routing signal cable through the back panel. The optional cable grip is shown (D) for customers running signal cable through the side panel. D Sensor E D) Optional cable grip. E) Alarm Horn Speaker F) USB Port for data retrieval , ST 2+ only. F Steri - Trac 2+ Only

8. 8 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) The E - Cell ® Sensor The Steri - Trac 2/2+ line also employ s ChemDAQ’s new E - Cell Sensor . The Sensor no longer attaches to the body of the monitor, as was the case with Steri - Trac 1’s standard configuration. Instead, t he Sensor is now an independent unit which transmits data back to the Area Monitor via USB cable or Bluetooth wireless. These options , along with the Sensor ’s smaller size, allows greater flexibility when determining optimal Sensor placement. ChemDAQ’s Sensor Exchange Program (SXP®) One popular feature of the ChemDAQ Steri - Trac line has not changed: The Sensor is still covered by ChemDAQ’s Sensor Exchange Program (SXP) , saving the customer the time and expense of in - house calibration. Here’s how SXP works: ChemDAQ tracks when your Sen sor s are due for replacement. At prescheduled intervals, ChemDAQ will ship a set of calibrated Sensor s to the customer along with easy - to - follow instructions for installing them, a process that takes only a few minutes for an average - sized system. A pre - pa id shipping label is included for return ing the expired Sensor s to ChemDAQ where they will be tested , recalibrate d , and then shipped to the next customer. The SXP program provides another valuable service : If any of your Sensor s malfunction before they are due for exchange and the issue cannot be resolved through technical support, ChemDAQ will ship you a replacement Sensor at no additional charge. SYSTEM - INSTALLATION INSTRUCTIONS begin on page 34 . However, we recommend you first become familiar with the system by reading the section The Steri - Trac 2/2+ System Components which begins on page 9 . Assistance is Only a Phone Call or Email Away: ChemDAQ Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 (USA and Canada) 1. 412.787.0202 x310 (Worldwide) E - Cell Sensor

28. 28 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Sensor Type Menu Path: Menu > [Passcode] > Sensor Type Here is where you enter the gas - type of the Sensor connected to the Area Monitor . This is a safety feature. If you accidentally install an ETO Sensor , for instance, where you are monitoring H 2 O 2 , the Area Monitor will display WRONG SENSOR until the correct Sensor is installed. Options are: ETO (Ethylene Oxide), H 2 O 2 (Hydrogen Peroxide), O 3 (Ozone), LEL (Lower Explosive Limit), O 2 (Oxygen), or PAA (Peracetic Acid) . The AUTO option configures the Area Monitor to automatically detect and accept any Sensor inst alled. AUTO should only be used, when advised by ChemDAQ, for Sensor types not on the default list. Selecting AUTO disables an important safety feature of the Steri - Trac 2/ 2+ Area Monitor . You will NOT be alerted if the wrong Sensor - type is accidentally installed. Bluetooth ® Menu Path: Menu > [Passcode] > Bluetooth Here is where you configure the Area Monitor to communicate wirelessly with a Sensor or a Remote Display. Instructions for Setting Up Bluetooth Wireless Communications: 1. Make sure the Sensor or the Remote Display is plugged into electrical power , using the power adapter included with your system. (See p. 14 . ) If the Sensor Cal - LED is not illuminated, press and hold the Sensor ’s power - button for about five seconds until it turns on. (See p. 12 .) 2. If you are connecting to a Remote Display, you will need to configure it for wireless communications. Follow the steps on p. 33 before proceeding. 3. At the Area Monitor , access the Bluetooth Interface shown above. To connect with a Sensor , press SENSOR CONNECTION; for Remote Display, press REMOTE DISPLAY CONNECTION. 4. The Area Monitor will now scan for Bluetooth devices within range and will list their serial number s and/or device name s o n the display. Devices are listed #1, #2 , etc. Using the virtual keypad, enter the number corresponding with your device. 5. Press BACK to return to the Home Display . Your Bluetooth Device is now connected. The Area Monitor might display a “No Sensor” message after connection. This will clear within a few seconds after system updating is complete.

13. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 13 The Steri - Trac 2 Remote Display The Steri - Trac 2 Remote Display is a wall - mounted unit that mimics the Area Monitor ’s local display as well as its audible alerts. The Remote Display allows personnel to view the status of the Area Monitor without having to enter the potentially hazardous area where the Sensor and the Area Monitor are located. (See sample application on p. 9 . ) If gas concentrations reach alarm - level, the Remote Display’s horn will sound and the relevant digits on the display will turn YELLOW or RED. The horn can be silenced by touching the field displaying the alarm , indicated by the yellow or red digits. Silencing the Remote Display will NOT silence the Area Monitor. (See table on p. 46 for a guide to all alarm indications.) The following configuration opti ons are available using the Remote Display’s menu system: • The touch screen can be passcode protected. • The Remote Display’s horn volume can be adjusted or disabled for noise - sensitive areas. • The horn’s re - arm time can be adjusted. • It can be configured for c ommunications type: wireless or cable. • The user can select what data will displayed in each field on the main display. • The unit’s Bluetooth device - name can be edited. • (Note: Alarm levels can only be set at the Area Monitor.) A thorough explanation of the m enu system begins on page 32 . Each Remote Display is dedicated to a single Area Monitor . That is, a Remote Display cannot receive data from more than one Area Monitor . The Area Monitor , however, can support up to three Remote Displays. A Remote Display receives data from the Area Monitor in one of two ways: Over a signal cable o r over wirele ss Bluetooth as shown below. The Remote Display requires 5VDC power. If configured for wireless Bluetooth communication, the Remote Display receives power from an external power adapter plugged into a local outlet. The power adapter has been included with your system. ( See p. 14 . ) In the cable - connected configuration , the Area Monitor supplies 15VDC to the Remote Display via the signal cable. An Area Monitor can com municate with only one Remote Display wirelessly. Additional Remote Displays require signal cabling. Signal cabling can be routed into the Remote Display through the cable grip on the bottom edge or through the 1.5 ” (3. 8 cm) cutout in the back panel. See pa ge 39 for mounting instructions. Note: When using the Bluetooth wireless communications for a single Remote Display, the Sensor must use the USB cable provided. The Steri - Trac 2/ 2+ cannot communicate wirelessly to more than one device at a time. See system configuration examples on p. 15 . The Steri - Trac 2 R emote Display

24. 24 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Time - Weighted Average Alarms Menu Path: Menu > [Passcode] > Alarms > Time Weighted Average Alarms Safety standa rds regarding chemical exposure are often stated in terms of average exposure level s - or time - weighted average s (TWA). For instance, the TWA Alarm interface shown below is set for the USA - OSHA’s TWA limits for e thylene o xide (ETO). The Short - Term Exposure Limit (STEL) is set for 5.0ppm average exposure level over fifteen minutes. The Permissible Exposure Limit (PEL , sometimes called a Long Term Exposure Limit ) is set for 1.0ppm average exposure level over eight hours. The TWA values displayed on the Steri - Trac 2/ 2 + Area Monitor are continually updated. If the TWA Alarm has been configured for a 15 - minute window (as shown below), then the TWA value displayed on the Home Display always reflects the average exposure level for the previous 15 minutes. Remember, the Area Monitor ’s TWA calculation is based on a “ moving time - window . ” S o, the displayed 15 - Minute TWA represents the average gas concentration during the last 15 - minute s, a window which began 15 minutes ago and end s at the present moment. Whenever the TWA value reaches or exceeds the alarm threshold, the Area Monitor will go into alarm : On the Home Display , the field displaying the TWA value will turn RED , and the alarm horn will sound. Setting Time - Weighted Average Alarm Parameters Menu Path: Menu > [Passcode] > Time Weight Average Alarms Notice in the figure above, the top set of controls apply to the minute - based TWA’s. The bottom controls apply to the hour - based TWA’s. C onfiguration options are explained below. On - Off Toggle Switch: When ON, the TWA alarm is enabled. When OFF, the TWA alarm is disabled. This feature is useful when the safety stan dards for a particular gas require , for example, an 8 - hour TWA but no short - term TWA , or where a TWA applies in some states/provinces, or countries but not others. Default - Custom Selector : When DEFAULT is selected, the alarm settings will revert to the f actory defaults based on the gas - type of the Sensor . You will find a list of default alarm values on p. 46 . If you wish to customize any alarm parameters, you must slide the selector to CUSTOM. [Continued next page.] Minute - based TWA’s are configured here. (01 - 59 minutes) Hour - based TWA’s are configured here. (01 - 24 hours)

19. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 19 The Menu System To access the Menu System in the Area Monitor , touch MENU on the HOME DISPLAY . This will bring up the passcode interface. If no user - passcode has been implemented, simply press ENTER to proceed to the Menu Display . Otherwise, input the passcode and press ENTER. For instructions on how to set the passcode, see p. 21 . Once the user enters the Area Monitor’s m enu system, it will temporarily suspend communications with th e Remote Display(s). The message NO COMM. will appear on the Remote Display. Normal communications will resume once the Area Monitor has returned to the Home Display . The Menu Display is shown below . The pages that follow provide an overview of each menu i tem as well as page - references where you’ll find more detailed explanations . • ALARMS : Here you can set the parameters for the instantaneous alarms , time - weighted average alarms . You can also adjust the horn - volume and its re - alarm time . (See p. 22 . ) • RELAYS : In the Relays Screen, you can select what condition will activate the Area Monitor ’s internal relays . These relays provide a set of dry contacts for connecting to external devices such as exha u st fans, strobe lights etc. For additional information on the RELAYS Interface , see p. 26 For a schematic showing the location of the relay terminals , see p. 50 . Before wiring to the Area Monitor ’s Internal Relays , please review the contact ratings on p 56 . • USER INFO : Here you can set the following user - specific information which is stored and/or displayed by the Area Monitor : Customer, Faci lity, Location, Monitor Name, Monitor Serial Number , Sensor Name, Sensor Serial Number . (See p. 27 for additional information.) • LOGGING: The Logging option only a ppears when a USB memory device is inserted in the Monitor’s USB port (Steri - Trac 2+ only) . The Logging feature allows the user to select the range of data to be downloaded, based on date and time. (See page 31 for complete instructions.) • SENSOR TYPE : Here you enter the gas - type of the Sensor connected to the Area Monitor. If the Area Monitor is paired with a S ensor of a different gas - type, a WRONG SENSOR error message is displayed. See p. 28 for configuration instructions.

53. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 53 E - Cell Sensor Problem Cause Resolution Sensor LED has turned YELLOW or RED. Sensor is overdue for calibration. See Sensor Status Indicator on p. 18 . Contact ChemDAQ Technical Services to arrange delivery of a calibrated Sensor. See contact info below. Cal - LED on Sensor is not illuminated. Sensor is not connected to electrical power or is not powered on. See p. 11 for diagram of Sensor.  Verify the Sensor is plugged into power. ( Verify the USB cable is securely connected to the Area Monitor and to the Sensor. OR Verify the power adapter is securely connected to the Sensor and plugged into a working electrical outlet.)  If necessary, p ress and hold (about 5 seconds) Sensor power button until LED comes on. If Sensor has been off charge, allow Sensor to recharge for three hours before calling technical support.  If Sensor will not power on, call ChemDAQ Technical Services. See contact inf o next page . Sensor Over - Range Error Message Gas concentration data from the Sensor has exceeded the upper limit of its detection range. IMPORTANT: Very high levels of target gas can cause the over - range condition. INVESTIGATE . Do not assume equipment malfunction.  Sensor is responding to very high target gas concentrations. Note: Many gases have no odor. INVESTIGATE.  Sensor is possibly reacting to cross - sensitive chemicals . See Cross - Sensitivity Table on p. 58 .  A Sensor that has been off external power for an extended period may result in a “ cold ” Sensor cell which will read artificially high when installed. Allow the Sensor to recharge by connec ting it to the Area Monitor or its P ower A dapter. Recharge time varies by Sensor Type, from a few minutes to a few hours.  Internal Sensor malfunction. Contact ChemDAQ Technical Services. Se e contact info next page . ChemDAQ Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide)

52. 52 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 4 : Troubleshooting Tables Steri - Trac 2/ 2 + Area Monitor Problem Cause Resolution Please Go t o Menu a nd Enter User Info... Message on Display You must enter User - Info to enable Monitor.  In the User Information interface. add customer - specific information. See p. 27 . WRONG SENSOR Error Message There is a mismatch between the Sensor gas - type and the Sensor - Type setting in the Area Monitor .  Connect the correct Sensor to the Area Monitor .  Or reconfigure the Area Monitor for the correct gas - type. (See p. 28 ) OUT OF CALIBRATION Error Message The Sensor has exceeded its calibration interval. Contact ChemDAQ Technical Services to a rrange delivery of a calibrated Sensor . See contact info below. Sensor Status Indicator is YELLOW or RED. The Sensor is approaching or has exceeded its calib ration interval. See p. 18 . Contact ChemDAQ Technical Services to arrange delivery of a calibrated Sensor. See contact info below. NO SENSOR Error Message The Area Monitor is not connected to a Sensor or cannot communicate with it.  For Sensor s connected via USB cable, verify cable connections are secure.  Verify Sensor is POWERED ON. See p. 12 .  For Sensor communicating via Bluetooth wireless, attempt to reestablish wireless connection. See p. 28 . Sensor Over - Range Error Message The signal from the Sensor is beyond its upper - limit detection range. See Sensor troubleshooting table on next page. “Heartbeat” Indicator is not flashing. (p. 17 ) The Monitor software has frozen. See instructions for manually resetting the unit on p. 55 . Touchscreen interface is not responsive. ChemDAQ Technical Services Department TechService@Chemdaq.com 800.245.3310 x310 (Within USA and Canada) 1. 412.787.0202 x310 (Worldwide)

27. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 27 Wrong Sensor: The relay is activate d when the Area Monitor is connected to a Sensor of the wrong gas - type. (E.g. An Area Monitor configured for the ethylene oxide Sensor is mistakenly paired with a hydrogen peroxide Sensor .) Not Used: If this option is selected, t he relay is deactivated . User Info rmation Menu Path: Menu > [Pas s code] > User I n fo Note: To unlock all the Monitor’s features, data must be entered in all four configurable fields. Here you can enter user - specific information which is stored and/or displayed by the Area Monitor . T o change any field, simply press the appropriate EDIT button and enter data using the virtual keyboard. Press ENTER when finished. Only the first four fields are user - configurable: Customer, Facility, Location, and Monitor Name. “Location” serves as a de scriptive label of the monitoring - poin t , that is, where your Sensor is located. This location will be displayed on the Home Display . In a room where there are multiple monitors, this helps personnel associate the Area Monitor with the correct Sensor . “Monitor Name” is a descriptive identifier for the Area Monitor itself. (e.g. Safety Dept. Mon #2) The monitor name is not displayed on the Home Display . Altitude Menu Path: Menu > [Passcode] > Altitude When the Area Monitor is first installed, it’s important to set the altitude correctly in FEET above sea - level (1 foot = .305 meters). Because air - density varies with elevation, the Sensor will use this value when calculating gas concentration. Here you enter the loca l elevation in feet - above - sea - level. Use the + / - buttons on the Altitude Interface to adjust the altitude. You must press SAVE for the new value to take effect. The altitude only needs to be set ONCE when the Area Monitor is first installed in a new location. The Area Monitor will store the altitude and transmit it to any Sensor connected to it for use in its calculations. You can easily find your local elevation by doing an internet search: “[your city], [your state] , [your country] elevation.” Make sure the elevation is expressed in FEET above sea level. (Multiply METERS by 3. 3 to convert to FEET.) Remember, y ou must press SAVE for ALTITUDE changes to take effec t . Note: The Sensor uses the CALCULATED DIVISOR in its calculations. The divisor is automatically updated each time ALTITUDE is changed.

35. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 35 • Height: Because the Steri - Trac Area Monitor ing System is designed for worker safety, most Sensor s should be placed as close as possible to the breathing zone — that is , about five feet ( 1.5m ) above the fl oor , which is approximately nose - level . If the molecular weight of the target gas is heavier than air (~28 g/mol), should the Sensor be placed closer to the floor? In locations where the air is static and gas s es can build up over time, such as in a confin ed space, the density of the target gas should be considered. In environments where air circulation keeps the gas and air mixed, relative densities are less a factor. In those instances, it’s more important to place the Sensor near the source of the gas an d/or near the breathing zone. • Environmental Parameters : Review the Sensor specifications starting on p. 56 and verify the environment is suitable for the Sensor. Pay special attention to cross - sensitivity and ambient temperature information. Cross - sensitivity tables are found on p. 58 . • Water or Chemical Spray: The Sensor is not designed for wet environments. Make sure it will not be exposed to moisture from water or chemical spray s . Warning: Excessive moi sture can block the Sensor cell’s porous membrane and reduce its sensitivity to the target gas, resulting in readings that are artificially low. For applications in wet environments, contact ChemDAQ for information on its line of water - resistant monitori ng system. • Protection from Collision / Dropping: The Sensor should not be located where it will be prone to collision damage from swinging doors, utility carts etc. • Sensor Accessibility: The Sensor will be swapped out periodically (usually every four months) as part of ChemDAQ’s Sensor Exchange Program, so make sure the Sensor is easily accessible. • USB Cable Limit : For Sensor connected to its Area Monitor via USB cable (rather than Bluetooth wireless) , the USB cable is 6 feet ( 2 m ) long. • Bluetooth Wireless Range: For Sensor s communicating to the Area Monitor over wireless Bluetooth, range is 10 to 15 feet ( 3 - 4.5m ) where there is a clear line of sight between the units. Intervening obstacles can reduce t he distance. For distances over 10 feet ( 3 m) or where there are intervening obstacles, ChemDAQ recommends testing Bluetooth communication before permanently mounting any components. Instructions for setting up Bluetooth communications are found on p. 28 .

58. 58 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 6 : Cross - Sensitivity Tables Ethylene Oxide Sensor Gas/Vapor Cross Sensitivity Ethylene oxide 100 % Ethylene 130% Carbon monoxide 1 0 % Ethanol 1 0 % Methyl ethyl ketone ~ 10% Propane 2 0 2 - Propanol/isopropanol 1 0 % Propylene 110% Propylene Oxide 90% Hydrogen Peroxide Sensor Gas/Vapor Cross Sensitivity Hydrogen Peroxide 100 % Carbon monoxide <1% Hydrogen sulfide - 180% Peracetic acid <70% Sulfur Dioxide 75% Peracetic Acid Sensor Gas/Vapor Cro ss Sensitivity Peracetic Acid 100 % Carbon monoxide < - 1% Chlorine 1 100% Chlorine dioxide 110% Hydrogen 0% Hydrogen peroxide 0 % Hydrogen sulfide 2 - 140 % Nitric oxide 0% Nitrogen dioxide 3 130% Ozone 130% 2 - propanol (IPA) < - 1% Sulfur dioxide 3 - 110 % Other Sensors Oxygen Sensor: No cross - sensitivity. Not f or use in high CO 2 environments. LEL Sensor : Cross - sensitivity to other HC based combustible gasses. Contact ChemDAQ for details. Notes: 1 - The ethylene oxide Sensor uses a filter to improve selectiv ity. Prolonged high exposure can overcome the filter and give greater cross sensitivity. 2 - Pure propane will not give a cross sensitivity, but liquid propane gas (LPG) and other propane fuels will often give a cross sensitivity because they contain high co ncentrations of propylene gas. Notes: 1 - Possible sources: Water purification processes, PVC manufacturing 2 - Possible sources: Breakdown of organics. Sewer gas, drilling /refining , petroleum, natural gas, wastewater treatment, coke ovens, tanneries, paper mills. 3 - Possible source: Fuel combustion

57. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 57 Area Monitor Data Recording Specifications For fast data downloads and optimal storage, data collected by the Area Monitor is compressed as follows: Recording Interval: Once per minute when readings are steady. Chang ing readings are recorded once a second. Data capacity: 16 Gigabytes, approximately 80 years ’ capacity . Data Export Format: Comma Separated Values (.csv) Recorded Data Points: W hen exported to a spreadsheet, each of the following data poin ts (CAPITALIZED) represents a column of data. DATE AND TIME ; PPM/% [displayed concentration of target gas], ADC [Analog to Digital Converter] COUNT , and the SENSOR TEMPERATURE [Celsius]. Also, Instantaneous Alarm Data: HIGH ALARM SETPOINT [as set by user], HIGH ALARM STATUS [0 or 1], LOW ALARM SETPOINT [as set by user], LOW ALARM STATUS [0 or 1]. TWA Alarm Data: TWA(MIN)VALUE [calculated minute - based TWA], MINUTE [TWA range in minutes as set by user], TWA(MIN)ALARM SETPOINT [as set by user], TWA(MIN)ALARM STATUS [0 or 1] , TWA(HR)VALUE [calculated hour - based TWA], HOUR [TWA range in hours as set by user], TWA(HR)ALARMSETPOINT [as set by user], TWA(HR)ALARMSTATUS [0 or 1]. Also, SENSOR SERIAL NUMBER, SENSOR BATTERY VOLTAGE, SENSOR LIFE COUNT [see Sensor Status Indicator on p. 18 ], NOTICE [1 = Incomplete User Info; 2 = No Se nsor; 3 = Out Of Calibration; 4 = Wrong Sensor Type; 5 = Sensor Out Of Range] E - Cell Sensor General Specifications Dimensions (w x h x d) : 4.6 ” x 3.25” x” x 1. 75 ” (11.7cm x 8.3cm x 4.4cm) Weight: 0.4 lbs. (180g) Sensor Cradle: 5” x 3.25 ” x 2” (12.7cm x 8.3 cm x 5.1cm) Performance Specifications by Sensor - Type Ethylene Oxide Hydrogen Peroxide Peracetic Acid Ring ID Color 1 Orange Light Blue Brown Range (ppm) 50 20 0 - 3ppm Resolution 0.1 0.1 0.01 Temperature Range (°C) - 20 ° C to +50 ° C 20 ° C to +50 ° C - 20 °C to +40 °C Response Time T90 (s) < 140 < 120 < 50s Recovery Time (s) < 140 <120 Repeatability (% of signal) 5 5 < the greater of +/ - 0.02 ppm or 5% of signal Linearity Deviation Over Range Linear Linear Linear Sensor Battery Life (Turned off , not on charge ) Will maintain bias about 2 weeks Batteries are not user - replaceable. 1 - The ID ring color of the Sensor , shown above , identifies its gas - type. Not shown on this chart: Oxygen Sensors are dark green; Ozone, light green. LEL S ensors, dark red. Contact ChemDAQ for information on other gases. Gas ID Ring

46. 46 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Appendix 1: Guide to Monitor Alarm s Default Alarm - Settings by Gas - Type Ethylene Oxide (ETO) Hydrogen Peroxide ( H 2 O 2 ) Peracetic Acid (PAA) Oxygen (O 2 ) Ozone (O 3 ) Lower Explosive Limit ( LEL ) Sensor ID Ring Orange Light Blue Dark Brown Dark Green Light Green Red Instantaneous Low Alarm 5.0 ppm 5.0 ppm 0.75 ppm 19 % 0.1ppm 25% Instantaneous High Alarm 50.0 ppm 20.0 ppm 1.5 ppm 23% 0.2ppm 50% 15 - Min TWA 5.0 ppm NA 0.4 ppm NA NA NA 8 - Hour TWA 1.0 ppm 1.0 ppm 0.2 ppm NA 0.1ppm NA For alarm - settings for other gas - types, contact ChemDAQ. Steri - Trac 2/ 2+ Area Monitor Alarm - Indication Guide Alarm Condition Visual Alert Audible Alert Normal Condition (No Alarm) Gas concentration has not reached alarm setpoints. Digits Displayed in GREEN None INSTANTANEOUS ALARMS (See p. 22 ) Low Alarm Current gas concentrations ≥ Low Alarm Setpoint Digits are YELLOW Pulsating Alert (Beep...Beep...) High Alarm Current gas concentrations ≥ High Alarm Setpoint Digits are RED Continuous Alert (Beeeeeeep...) TIME - WEIGHTED - AVERAGE (TWA) ALARMS (See p. 24 ) Minute - Based TWA Alarm Average gas concentration for last X* minutes ≥ Alarm Setpoint. Digits are RED Continuous Alert (Beeeeeeep...) Hour - Based TWA Alarm Average gas concentration for last X* minutes ≥ Alarm Setpoint. Digits are RED * X=number of minutes or hours selected in the TWA interface screen. See p. 24 . Silencing Alarms: To silence an alarm at the Area Monitor or the Remote Display, press the field on the touchscre en showing the alarm (i.e. where the digits have turned RED or YELLOW). Each Monitor and Remote Display must be silenced individually.

11. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 11 The E - Cell ® Sensor The E - Cell Sensor is the component which detects the target gas. The Sensor contains the detection cell and the processing circuitry which calculates gas concentrations. This data, usually expressed in parts - per - million, is transmitted to the Area Monitor via USB cable or Bluetooth wireless . Each Sensor is designed for one specifi c gas - type . The color of the identification ring , shown below, indicates which gas - type the Sensor is designed to detect. (On p. 46 is a list of available gas - type s and their identification rings. ) While the Steri - Trac 2/ 2+ Area Monitor can work with a ny E - Cell Sensor , the correct gas - type must be selected in the Monitor’s configuration options. If the Area Monitor is paired with a Sensor of a different gas - type, it will display a “Wrong Sensor” error message. The target gas reaches the Sensor cell through the natural process of diffusion . Many types of electrochemical Sensor s respond to more than one gas . T o solve this problem of cross sensitivity, some ChemDAQ E - cell Sensor s (EtO and PAA) are equipped with ChemDAQ’s Spot - On filter which scrubs out common chemicals that can cause false positives. (For additional information on cross - sensitivity, see p. 58 . ) The Sensor requires 5VDC power which it receives from the Area Monitor over USB cable. When configured for wireless Bluetooth communication, the Sensor uses a n external power adapter , included with the system, which plugs into a loca l outlet (See p. 14 ) . When the unit is powered, from either source mentioned above, both the Cal LED and the LED R ing on the power button will be illuminated. The Cal LED also indicates the Sensor ’s calibration status and is based on an internal timer which is reset each time ChemDAQ calibrates the Sensor . If the LED is GREEN , the unit is operating within its calibration period. A YELLOW or RED LED indicates the Sensor is due for calibration. (Also, see Sensor Status Indicator on p. 18 .) Note: For safety reasons, i f the LED turns YELLOW or RED (urgent) , please contact ChemDAQ immediately to verify replacement Sensor s are on the way. Once a Sensor is 50 % beyond its calibration expiration date, the Monitor will display “ Calibration Re quired ” and will no longer show gas - concentration data. (Example: A Sensor with a four - month calibration interval will display “Calibration Required” at six months.) An uncalibrated Sensor may not be working correctly and can induce a false sense of securi ty. ChemDAQ Technical Services : USA and Canada: 800.245.3310 x310 . Worldwide: 1. 412.787.0202 x310 . Email: TechService@Chemdaq.com Cal LED Power Button/ LED Ring The E - Cell Sensor US B Port/ Power Port Gas ID Ring

6. 6 ChemDAQ ST 2/ 2+ Gas Monitoring System User ’s Manual (CM - 500 - A - 3.00) Date and Time ................................ ................................ ................................ ................................ ............................ 29 Display ................................ ................................ ................................ ................................ ................................ ........... 29 Zeroing ................................ ................................ ................................ ................................ ................................ .......... 30 Data Logging ................................ ................................ ................................ ................................ ............................... 31 5. A Guide to the Remote Display’s Touchscreen Interface ................................ ................................ .......... 32 Home Display ................................ ................................ ................................ ................................ ............................. 32 Remote Display Menu System ................................ ................................ ................................ ............................. 32 Alarms ................................ ................................ ................................ ................................ ................................ ....... 32 Display ................................ ................................ ................................ ................................ ................................ ...... 32 Bluetooth ................................ ................................ ................................ ................................ ................................ . 33 Configuring a Remote Display for Wireless Communication ................................ ................................ . 33 6. System Installation Instructions ................................ ................................ ................................ ......................... 34 A. Determining Component Placement ................................ ................................ ................................ ....... 34 B. Installation Kit and Tools Required ................................ ................................ ................................ ......... 39 C. Mounting Instructions for Area Monitor / Remote Display ................................ ............................... 39 D. Installing the Sensor ................................ ................................ ................................ ................................ ........... 42 E. Initi al Configuration of Monitor Software ................................ ................................ ................................ . 44 Appendix 1: Guide to Monitor Alarms ................................ ................................ ................................ .................. 46 Default Alarm - Settings by Gas - Type ................................ ................................ ................................ ................. 46 Steri - Trac 2/2+ Area Monitor Alarm - Indication Guide ................................ ................................ ............ 46 Summary of ACK and LATCH Settings ................................ ................................ ................................ ............. 47 Appendix 2: Sensor Exchange Instructions ................................ ................................ ................................ ........ 48 Appendix 3: Circuit Board Schematics ................................ ................................ ................................ .................. 50 Appendix 4: Troubleshooting Tables ................................ ................................ ................................ .................... 52 Steri - Trac 2/2 + Area Monitor ................................ ................................ ................................ .............................. 52 E - Cell Sensor ................................ ................................ ................................ ................................ ............................... 53 Remote Display ................................ ................................ ................................ ................................ .......................... 54 Manually Resetting the Area Monitor or Remote Display ................................ ................................ ....... 55 Appendix 5: Component Specifications ................................ ................................ ................................ ................ 56 Appendix 6: Cross - Sensitivity Tables ................................ ................................ ................................ .................... 58 A one - page Easy - Reference Guide has been included with your system. It provides a basic overview of the Steri - Trac 2/2+ Area Monitor as well as important page references in the manual.

5. ChemDAQ ST2+ Gas Monitoring System User ’s Manual ( CM - 500 - A - 3.00 ) 5 Contents Safety Notices ................................ ................................ ................................ ................................ ................................ ..... 4 1. Welcome to the Steri - Trac 2/2+ Gas Monitoring System ................................ ................................ ........... 7 The E - Cell Sensor ................................ ................................ ................................ ................................ ........................ 8 ChemDAQ’s Sensor Exchange Program (SXP) ................................ ................................ ................................ 8 2. The Steri - Trac 2/2+ System Components ................................ ................................ ................................ ......... 9 Overview ................................ ................................ ................................ ................................ ................................ ........ 9 Sample Installation ................................ ................................ ................................ ................................ ..................... 9 The Steri - Trac 2/2+ Area Monitor ................................ ................................ ................................ ..................... 10 Steri - Trac 2 vs. 2+ ................................ ................................ ................................ ................................ ..................... 10 The E - Cell Sen sor ................................ ................................ ................................ ................................ ...................... 11 The Steri - Trac 2 Remote Display ................................ ................................ ................................ ....................... 13 The External Power Adapter ................................ ................................ ................................ ................................ 14 Examples of System Configuration ................................ ................................ ................................ .................... 15 3. Overview of Area Monitor’s Touchscreen Interface ................................ ................................ ................... 16 The Home Display ................................ ................................ ................................ ................................ ..................... 16 The Menu System ................................ ................................ ................................ ................................ ...................... 19 4. A Detailed Guide to the Area Monitor Menu Operations ................................ ................................ .......... 21 Passcode ................................ ................................ ................................ ................................ ................................ ....... 21 Setting/Changing the Passcode ................................ ................................ ................................ ...................... 21 Entering the Passcode ................................ ................................ ................................ ................................ ........ 21 Alarms ................................ ................................ ................................ ................................ ................................ ........... 22 Instantaneous Alarms ................................ ................................ ................................ ................................ ........ 22 Setting Instantaneous Alarm Parameters ................................ ................................ ................................ .. 23 Time - Weighted Average Alarms ................................ ................................ ................................ .................... 24 Re - Alarm Time ................................ ................................ ................................ ................................ ...................... 25 Alarm Volume ................................ ................................ ................................ ................................ ........................ 25 Alarm Test ................................ ................................ ................................ ................................ ............................... 26 Relays ................................ ................................ ................................ ................................ ................................ ............. 26 User Information ................................ ................................ ................................ ................................ ....................... 27 Altitude ................................ ................................ ................................ ................................ ................................ .......... 27 Sensor Type ................................ ................................ ................................ ................................ ................................ . 28 Bluetooth ................................ ................................ ................................ ................................ ................................ ...... 28 Instru ctions for Setting Up Bluetooth Wireless Communications: ................................ ................. 28 Other Bluetooth Wireless Settings ................................ ................................ ................................ ................ 29

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