Environmental Monitoring are a specialist supplier of pid’s ( photo ionisation detectors) for hire and sale. What makes us different? When you hire from us, immediately your getting an expert advising you. We will go through your monitoring application and determine whether if the instrument if suitable for your application. Not all vapours can be monitored and measured using a pid. it may require an fid, or infra red monitor, it may even by ftir or gc monitoring that is required. For speciation the simplest method is using absorption tubes followed by analysis.
Recently a pharmaceutical client needed to measure a specific solvent in a vent stream. However we were able to determine that two factors made it not useable. 1st the the ionisation potential was such that it would not be visible and secondly there was moisture in the stream. This would cause the lamp not to work
In order for a gas to be “visible” the ionisation potential(ip) of the gas being monitored must be less than that of the lamp. A standard lamp has a IP of 10.6 eV so that a solvent such as IPA with an IP of 10.1 will be “visible” and can therefore by monitored. Whereas a substance such as carbon tetrachloride has an ip of 11.47. it will not be “visible” to a 10.6 eV lamp but can been “visible” to a 11.7 eV lamp
For further information and help with you monitoring contact Environmental Monitoring