Properties and Applications:
Low levels of Volatile organic compounds (VOCs) can arise in many situations, from solvents, fuels, off-gassing from materials containing them. ChemDAQ offers two sensor technologies for the detection of VOCs, photoionization (PID) and electrochemical (EC); the optimum sensor type depends on the application.
Some representative compounds are shown in the table below. Contact ChemDAQ for information on other VOCs.
Compounds |
Formula |
IP (eV) |
Oxidation |
Acetone |
CH3COCH3 |
9.7 |
Yes |
Benzene |
C6H6 |
9.25 |
|
Carbon Monoxide |
CO |
14.0 |
Yes |
Ethanol |
CH3CH2OH |
10.47 |
Yes |
Ethylene |
CH2=CH2 |
10.51 |
Yes |
Formaldehyde |
CH2O |
10.87 |
Yes |
Toluene |
C6H5CH3 |
8.82 |
Yes |
In order for the PID detector to measure the gas, the ionization potential of the gas must be the same or less than the lamp energy. The ChemDAQ sensor uses a lamp energy of 10.6 eV. Contact ChemDAQ to determine the optimum sensor technology for your application.
Steri-Trac® VOC-PID Monitor
Availability: Special order
Specifications:
Sensor Type PID (10.6 eV)
Range: 0 – 50 ppm
Resolution: 0.05 ppm
Temp Range: -20 to +50 oC
Response time (t90): <30 s
Steri-Trac® VOC-EC Monitor
Availability: Special order
Specifications:
Sensor Type Electrochemical
Range: 0 – 10 ppm
Resolution: 0.1 % LEL
Temp Range: -20 to +50 oC
Response time (t50): <30 s
Notes:
- The sensors can be calibrated for individual gases – contact ChemDAQ for more details.
- Specifications subject to change
- Users should determine the concentrations at which specific VOCs become hazardous.
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