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.

The PA4000’s versatility makes it the ideal monitoring solution for a wide variety of applications in diverse industries, including: agriculture, chemical, oil & gas, petrochemical, and semiconductors. It is ideal for use in applications where the lowest possible levels of gas must be detected; where facilities are exposed to gases or compounds that can complicate the ability to detect a particular gas; or in facilities using combustible gases requiring explosion-proof monitors.

The PA4000 Gas Monitor excels at monitoring fuel leaks in refinery applications due to its ability to detect gas at extremely low ppm levels and its sample draw system, which can pull gasoline vapor to the sensor from up to 500 feet away. The PA4000 is ideal for measuring toluene given off during gasket material manufacturing at levels as low as 5 ppm. It is also ideal for measuring ambient nitrogen trifluoride leaks in semiconductor manufacturing where cleaning solvents commonly interfere with traditional pyrolyzer/HF sensors.

The PA4000 is easy to install, operate and maintain. Most installations are as simple as mounting the instrument, connecting the sample line, and powering the unit. In its most common configuration the monitor draws gas samples via an internal pump, which enables the device to monitor areas that are hard to reach. It can also operate by delivering a pressurized sample to the unit. In the case of blockage by a dirty end-of-line filter or clogged sample line, the instrument alerts operators by initiating a fault signal.

Similar to traditional gas sensors, the PA4000 Gas Monitor indicates gas concentrations and alarms. The direct reading display shows the actual gas value as well as any current alarms and diagnostic messages. The gas monitor is factory pre-calibrated so that it arrives ready to detect a specific gas at a desired range.

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.

The PA4000 blends top performance with affordability for detecting a variety of gases. It currently detects more than 50 common industrial gases -- with many other applications possible. It is ideal for installations that require detection of a toxic or combustible gas at a very low level, particularly in an environment where cross-sensitivity is an issue.