What is a PID?

Photo-Ionisation Detectors (PIDs) will detect and measure around 400 Volatile Organic Compounds (VOCs). A PID will also detect and measure some inorganic gases.

Today PIDs are used across many industries including petrochemical, manufacturing, marine, pharmaceutical and printing. They are also used by organisations responsible for land clean-up, fire investigation and HAZMAT teams within civilian and the military services.

Over the years PIDs have become more attractive through the reduction of the size and weight of instruments, making them more portable and easier to handle. Portable PIDs have been used for over 40 years and now personal wearable devices are also available to provide individual protection for workers in situations where there is a possibility of over exposure to toxic volatile compounds.

PIDs are very sensitive monitoring devices which allow us to detect hundreds of different compounds at very low levels. A PID uses an ultra-violet lamp to ionise chemicals which are subsequently detected over electrodes, thereby measuring their concentrations in parts-per-million (ppm) or parts-per-billion (ppb).

Straightforward to use with a variety of applications, a PID is best used to detect low levels (0-3000 ppm) of broad band toxic chemicals or VOCs. Breakthroughs in lamp and sensor technology allow a PID to be small, rugged (resistant to contamination and humidity) and affordable.

Main advantages of a PID sensor:

- Instantaneous display, updated every second, for real time monitoring of toxic chemicals and VOCs.

- STEL, TWA and Peak values, updated every minute, accessible to the user at the end of the work shift.

- Threshold monitoring - visual and audio alarms in real time for STEL, TWA and Peak. Alarm signals vary for each condition.

- Data log for compliance and work shift trend analysis.




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