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PID sensors for measurement of VOCs and particulate matter

| By Gerald Ondrey

Photoionization detection (PID) is a recommended technology for detecting volatile organic compounds (VOCs) in many applications, such as environmental monitoring, industrial health and safety, air quality, facility/site monitoring and fugitive emissions. One of the unique features of this company’s MiniPIDs (photo) is a patent-protected design with a third electrode that overcomes humidity interference, delivering a stable signal from 0 to 99% relative humidity (RH). The sensitivity of PID sensors is extremely important in many applications, particularly where the sensors are deployed in the measurement of trace VOCs. The NextPM sensor was recently added to the company’s portfolio. The NextPM sensors show strong to very strong correlations for both PM1.0 and PM2.5 with reference instruments costing several hundred times the cost of the sensors, the company says. — ION Science Ltd., Fowlmere, U.K.