Product Descriptions

The PID-A1 and PID-AH measure volatile organic compounds (VOCs) in air by photoionisation detection (PID), which is shown schematically

below. Test gas (1) is presented to the membrane filter at the top of the photoionisation cell and freely diffuses into and out of the underlying

chamber formed by the filter, housing walls, and a UV lamp window. The lamp emits photons (shown by arrows) of high energy UV light,

transmitted through the window. Photoionisation occurs in the chamber when a photon is adsorbed by the molecule, generating two electrically

charged ions, one positively charged, X+, and one negatively charged,

Y- (2a). An electric field, generated between the cathode and anode electrodes, attracts ions (2b). The resulting current, which is proportional to

the concentration of the VOC, is measured and used to determine the gas concentration. The PID-A includes a third fence electrode (patented)

to ensure that the amplified current does not include significant contributions due to other current sources such as water condensation on the

chamber walls.

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