PID Phocheck Tiger LT

The Phocheck Tiger LT volatile organic compound meter offers an ideal combination of fast response, ease of use and maintenance, small size and the ability to detect low levels (in the parts per million, ppm, range) of many so-called volatile organic compounds (VOCs). PIDs (photoionisation detectors) are able to effectively detect and monitor several hundred, if not thousands, of hazardous substances.

Measuring range: 0 – 5000 ppm.

Sensitivity: 0.1 ppm.

Battery life: 24 hours. Battery charging time: 6 hours.

Revolutionary PID sensor technology: humidity-resistant and contamination-resistant.

Response time: 2 seconds.

What does “ionisation” mean?
When the sampled gas absorbs energy from the PID lamp, it becomes “excited” and its molecular content is altered. The compound loses an electron (e-) and becomes a positively charged ion. Once this happens, the substance is considered “ionised”.

Operating principle
PIDs rely on ionisation as the basis for detection. Most substances can be ionised, but some are ionised more easily than others. This ability of a substance to be ionised is measured on an electron-volt (eV) energy scale. This scale generally ranges from a value of approximately 7 to 16. Substances with a rating of 7 are very easy to ionise. Substances with an eV rating between 12 and 16 are extremely difficult to ionise.

When the chemical compounds being monitored have been ionised inside the instrument, a current is produced whose electrical potential difference is measured, and the concentration of the compound is shown on the meter display in parts per million based on that measurement. PIDs use an ultraviolet (UV) lamp to ionise the compound being monitored. The lamp, usually about the size of an ordinary torch bulb, emits ultraviolet energy to ionise the compound.

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