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There are some compounds with an I.P. greater than 11.7eV. These compounds cannot be measured using a PID:
- Air - nitrogen, oxygen, water, carbon dioxide etc
- Toxics - carbon monoxide, hydrogen cyanide, sulphur dioxide
- Natural gas - methane, ethane
- Acids - hydrogen chloride, hydrogen fluoride, nitric acid
- Others – Freons, ozone.
There is alternative technology available to measure these substances. If you need further clarification for any compound, contact Shawcity and we will be happy to advise you.