Transcription of Chapter 6 Photoionization Detectors
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Chapter 6 Photoionization Detectors
73 Chapter 6 Photoionization DetectorsChapter 6 PhotoionizationDetectorsThe Photoionization detector (PID) utilizes ultra-violet light to ionize gas molecules, and is com-monly employed in the detection of volatile or-ganic compounds (VOCs). This technique originallyfound use in bench top laboratory instruments, butits complexity limited its use elsewhere. The heart ofthe Photoionization detector is an ultraviolet source,which is essentially a lamp. Early versions of this lampused electrodes inside the lamp similar to those usedin the early days of the vacuum tube and were quitecostly to lamps used today do not contain electrodesand are both less costly and have a longer life expect-ancy. In the 1980s, with the advent of integrated cir-cuit (IC) technology, the electronics that were de-signed were better able to process the small signal fromPID sensors into useful and reliable , requirements for the monitoringof underground storage tanks to help preventground water contamination began to emerge,which required monitoring of events led to the design of small, portablePIDs (see Figure 1) that have proven to be both prac-tical and reliable, and which offer fast response andthe ability to detect low gas concentrations.
73 Chapter 6 Photoionization Detectors Chapter 6 Photoionization Detectors T he photoionization detector (PID) utilizes ultra-violet light to ionize gas molecules, and is com-
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