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Gas Monitors New IR Gas Monitor Undisturbed by Vapours

Editor: Dominik Stephan

A new gas monitor tries to eliminate the vapour problems common to IR monitors.

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The PA4000 gas monitor uses infrared sensors to measure the most common gases. (Picture: General Monitors)
The PA4000 gas monitor uses infrared sensors to measure the most common gases. (Picture: General Monitors)

General Monitors new infrared gas monitor PA 4000 provides precise gas monitoring while eliminating disturbances from vapours, the manufacturer says. The PA 4000 uses a modern photoacoustic, infrared sensor to monitor a variety of gases including hydrocarbons, solvents, alcohols, CO2, CO and others. The company claims the unit to work highly selective to the gas of interest and operate for months with virtually no drift.

Its proprietary sensor technology determines the amount of water vapour in the sample and subtracts it from the gas reading – thus eliminating the vapour problem common to infrared analysers.

With a range of 0-1000 ppm depending on the specific configuration, the PA4000 Gas Monitor is accurate to ± 2 ppm at 0-100 ppm and ± 10% of reading from 100-1000 ppm. The PA4000 features sensitivity of 2 ppm and resolution of 1 ppm, with specifications for other ranges dependent on application. For certain gases, it detects concentrations as low as 0.01 ppm.

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