Photoionization detectors (PID) are multi-sensor chemical detectors that are non-specific and has a gas-phase. These PIDs are used with volatile organic compounds (VOCs) that are identified as the primary class of chemicals. PIDs can also be punched with other gas meters, usually the one that detects oxygen, flammability, carbon monoxide and hydrogen sulfide. Moreover, the VOCs used with the PIDs are organic with carbon containing chemicals that are highly toxic and exist in vapor form. ... Read more