Concept: Photoionisation meter: Typical photoionization detectors(PID) measure volatile organic compounds and other gases in concentrations from parts per billion(ppb) to 10 000 parts per million (ppm). The photoionization detector is an efficient and inexpensive detector for many gases and vapor analytes. PIDs produce instantaneous readings, operate continuously, and are commonly used as detectors for gas chromatography or as hand-held portable instruments. A PID is a very sensitive instrument used in a wide variety of applications such as: ● Industrial hygiene and safety ● Environmental contamination and remediation ● Hazardous materials handling ● Ammonia detection ● Lower explosive limit measurements ● Arson investigation ● Indoor air quality ● Cleanroom facility maintenance