General Monitors PA4000 Photoacoustic Gas Monitor Measures Without Vapor Interference

The PA4000 Photoacoustic Infrared Gas Monitor from General Monitors provides gas monitoring while without interference from water vapors. The PA4000 Gas Monitor is designed with an advanced photoacoustic, infrared (IR) sensor to monitor a variety of gases including hydrocarbons, solvents, alcohols, CO2, CO and other dangerous gases. It is stable and highly selective to the gas of interest and can operate for months with virtually no drift.

The PA4000 Gas Monitor eliminates a problem common to infrared analyzers: cross-sensitivity to water vapor. It features a proprietary sensing technique that determines the amount of water vapor in the sample and subtracts it from the gas reading. This technique allows the gas reading to be stable with no compromise to measurement sensitivity.

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.

The PA4000 Gas Monitor operates over a wide temperature range of 32 degrees F to 122 degrees F (0 degrees C to +50 degrees C) and has a storage temperature range of -67 degree F to +158 degree F (-55 degreeC to +70 degree C). It has a temperature effect of 0.3% per degree (C) of reading and operates at a humidity range of 0-95% relative humidity, non-condensing.

The PA4000 Gas Monitor can be configured to monitor from up to eight remote areas, with standard features including a vacuum fluorescent display, audio alarm and four relays. The unit can be housed in general purpose, explosion-proof or rack-mount enclosures. It also offers standard 4-20 mA and 0-10 V outputs. The multipoint sequencer option allows expansion of the PA4000 to monitor up to 8 locations with the display indicating the monitored location with its corresponding gas concentration.