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GAS25 Polytec II Tubes
Gastec Polytec Tubes expedite analysis by simultaneously measuring a variety of gases during a single test session. Each highly sensitive, semi-quantitative tube can detect from 9 to 15 chemicals, providing cost-effective monitoring and chemical identification.
Download the Gastec Polytec Tubes Datasheet for tube specification
Q. A customer uses GAS25 Polytec-II tube. The CO (yellow) layer on the upper tube turned to be blackish brown. This colour change to blackish brown did not occur immediately but was noticed the next day. The customer wants to know if this indicates that there was some mercaptan exposure. It does look like a blackish brown inlet discolouration though could also result from CO? Can you comment?
A. The blackish brown layer was not caused by mercaptan but by CO when you did not find it right after the measurement. In any case, we do not recommend you to consider the result of the following day.
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