Understanding Pid Gas Sensing Technology

Understanding PID Gas Sensing Technology

In the event of leak detection, perimeter monitoring, spill delineation, remediation or arson investigation, photoionisation detection (PID) Gas Sensor technology can measure low concentrations of volatile organic compounds (VOCs).

18th August 2020

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PID Gas Sensors

ION Science PID Gas Sensors effectively detect and monitor for numerous hazardous substances, providing maximum benefit and safety to users. Since VOCs are combustible and toxic at differing concentrations, industrial facilities that utilize organic materials would benefit from the implementation of a MiniPID Gas Sensor, or a gas detection system incorporating PID technology.

In addition to offering an ideal combination of speed-of-response, ease-of-use, and low maintenance, MiniPID gas sensors provide real-time readings of VOCs, such as benzene, toluene, hexane, phosphine and more. MiniPID gas sensors can detect these gases through dynamic detection ranges of parts-per-million (ppm) or parts-per-billion (ppb) levels.

As a sensitive and effective tool, Gas Sensors rely on ionization as the basis of detection. When chemicals being monitored have been ionized, or the ions have been positively charged inside of the instrument, a current is produced, and the concentration of the compound is displayed as parts-per-million on the meter.

MiniPID Gas Sensors utilize an ultraviolet (UV) lamp to ionize the compound to be monitored. The lamp then emits enough ultraviolet energy to ionize the compound.

Which Lamp To Use

Three PID lamps are available from ION Science with photon energies of 10.0 eV, 10.6 eV, and 11.7 eV.

Figure 1 shows a lamp can only detect compounds with ionization energies (IE) equal to or below that of the lamp energy. So, a 10.6 eV lamp can measure methyl bromide with IE of 10.5 eV and all compounds with lower ionization energy, but cannot detect methanol or compounds with higher IE.

The choice of lamp depends on the application; but the standard 10.6 eV lamp which is the lowest cost and has a longest working life of up to a few years is usually recommended. For high IE compounds like chloroform, it is necessary to use the 11.7 eV lamp, which has a short life of only a few months.

ION Science offers a range of gas sensors that incorporate leading photoionization detection technology for the fast, accurate detection of VOCs in the harshest of environments.

Designed for OEMs, ION Science manufactures and supplies more Gas Sensors than any other company in the world, capable of responding to thousands of VOCs across many diverse applications.

Figure 1 – PID lamp energy thresholds
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Application Article

Everything you need to know about effectively detecting and monitoring numerous hazardous gases, providing maximum benefit and safety to users

Our Application Articles are available to download below, they provide you with key information on the exposure limits and the locations of where potentially harmful gases can occur within your application and share information on the gas sensing technologies that can help you manage gas detection in the a wide range of applications.

Understanding PID Gas Sensing Technology

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