Summary of Third Party Testing of ChemDAQ Steri-Trac® Peracetic Acid Monitor

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1. Page 1 of 1 U:\R&D\Peracetic acid\Medivators Testing of SteriTrac\Summary ofThird Party Testing of ChemDAQ Steri-Trac Peracetic Acid Monitor Feb 2015.doc Summary of Third Party Testing of ChemDAQ Steri-Trac ® Peracetic Acid Monitor February 2015 Background This document summarizes the findings from two reports of testing performed by a major automatic endoscope reprocessor manufacturer on the ChemDAQ peracetic acid (PAA) Steri-Trac monitor between October and December 2014. Accuracy and Linearity To test the accuracy of the Steri-Trac monitor, a test gas containing PAA was generated by bubbling air through solutions of PAA and measuring the PAA in the gas stream using the spectroscopic method of Effkeman et al 1 based on the reaction of PAA with 2,2'- azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) to form a dark green oxidation product. There was excellent linearity between the Steri-Trac and the spectroscopic method (R 2 = 0.9995), but PAA concentrations measured by the spectroscopic method were about 10% less than the Steri-Trac. A 10% deviation in calibration is well within acceptable margins. There will be errors in calibration of the ChemDAQ monitor, in the spectroscopic procedure and errors due to experimental differences in how the gas is applied to the monitor. The tests were performed about four months after the monitor’s sensor was last calibrated. This overall error of about 10% is well below the NIOSH specification for gas monitoring of < 25% 95% of the time. 2 Response Time A 10 ppm PAA test gas was generated by bubbling air through PAA solution (~0.05% PAA). The monitor reached the high alarm (9.00 ppm PAA) in less than 15 seconds. Note: 9 ppm is outside the specified range for this sensor, (6 ppm). Selectivity The monitor responded to PAA vapor but did not respond when tested with only water vapor, acetic acid vapor and hydrogen peroxide vapor, showing excellent selectivity to PAA. Summary The third party manufacturer found that the Steri-Trac monitor was very selective to PAA, had a fast response time and linear response to PAA and the overall accuracy of the response was within acceptable limits. 1 Effkemann S1, Brødsgaard S, Mortensen P, Linde SA, Karst U., Fresenius J. anal. Chem (2000), 366, 361-4 2


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