General Questions & Answers

What is a PID - Photo-Ionization Detector?

A PID is a very sensitive broad-spectrum monitor, like a low-level LEL monitor. A Photo-Ionization Detector measures VOCs and other toxic gases in low concentrations from ppb (parts per billion) up to 10,000 ppm (parts per million or 1% by volume). A PID uses an Ultraviolet (UV) light source (Photo= light) to break down chemicals to positive and negative ions (Ionization) that can easily be counted with a Detector.