What does a PID NOT measure?

There are some compounds with an I.P. greater than 11.7eV. These compounds cannot be measured using a PID:

- Radiation

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.

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