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PID - VOC Gas Detectors

PID Detectors - Using Photo-ionization Detectors to Measure VOCs


Photoionization detectors use high-energy ultraviolet light from a lamp housed within the detector as a source of energy used to remove an electron from neutrally charged VOC molecules, producing a flow of electrical current proportional to the concentration of contaminant.

The amount of energy needed to remove an electron from the target molecule is called the ionisation potential (IP) for that substance. The larger the molecule, or the more double or triple bonds the molecule contains, the lower the IP. Thus, in general, the larger the molecule, the easier it is to detect! This is exactly the opposite of the performance characteristics of the catalytic hotbead type combustible sensor.

Photoionization detectors are easily able to provide readings at or below the OEL or TLV® for all of the VOCs listed in Table 1, including diesel. The best approach to VOC measurement is often a multi-sensor instrument equipped with both LEL and PID sensors
Multi-sensor Detectors with PIDs Catalytic hot-bead combustible sensors and photoionization detectors represent complementary,
not competing detection techniques. Catalytic hot-bead sensors are excellent for the measurement of methane, propane, and other common combustible gases that are not detectable by means of a PID. On the other hand, PIDs can detect large VOC and hydrocarbon molecules that are effectively undetectable by hot-bead sensors, even when they are operable in PPM measurement ranges. 

The best approach to VOC measurement in many cases is to use a multi-sensor instrument capable of measuring all the atmospheric hazards that may be potentially present. Having a single instrument equipped with multiple sensors means no condition is accidentally overlooked.

Please see a selection of PID detectors below as single gas models or multi gas models. 

Showing 14 products of 14

Showing 14 products of 14

  •  Industrial Scientific SafeCore Module|Gas Monitor Point

    Industrial Scientific

    Industrial Scientific SafeCore Module

    £1,000.00 - £2,410.00
  • Industrial Scientific Radius BZ1|Gas Monitor Point
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    Industrial Scientific

    Industrial Scientific Radius BZ1

  • BW Gas Alert Micro 5  - Multi Gas Detector - Front View

    Honeywell BW Technologies

    BW Gas Alert Micro 5 - Multi Gas Detector - Standard - IR

    £720.00 - £1,269.00
  • BW Ultra front view in black and yellow

    Honeywell BW Technologies

    Honeywell BW™ Ultra 5 Gas Monitor

    £951.15 - £1,492.60
  • GMI PS 500|Point Safety
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  • ToxiRAE Pro PID Front View
  • RAE MultiRAE Lite 6 Gas Monitor (Models PGM-6208 and PGM-6208D)
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  • ppbrae front view
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  • MultiRAE Benzine with tube disconnected
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  • RAE MultiRAE Advanced 6 Gas Monitor (Model PGM-6228) Multi Gas Detector
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  • RAE MultiRAE PRO Advanced 6 Gas Monitor (Model PGM-6248) Multi Gas Detector
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  • RAE MiniRAE Lite Portable Handheld VOC Monitor (PGM-7300 or PGM-7350 Series)
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  • MiniRae 3000 PID Detector Image
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  • Ultrarae pid gas detector
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