How does a PID identify a specific VOC?

Many PID users will identify VOCs and may not be aware of the compound or compounds that are being measured. If you have no idea regarding the specific compounds, the measurement is still important but further investigation is needed. Without being able to qualify the exact compound, the measurement should be presented as an equivalent reading with reference to the calibration gas used. The calibration gas commonly used is isobutylene, so the gas value is ‘isobutylene equivalent’.

If you know there are several compounds in the sample it is virtually impossible to accurately identify the health risk. This is an issue if one of the compounds is highly toxic and the others present are mildly toxic. Under these circumstances a PID should be considered a simple screening device, and further consideration given to more detailed analysis.

For further help and advice, please contact us and we will be happy to discuss your specific circumstances. 

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