Sensor for hazardous Gases and hazardous Area

ALVI – India (  in association with Gas Alarm Systems – Australia ( offer hazardous area sensor.

Microprocessor based gas sensor with 4 – 20 mA / RS485 Modbus output signal, alarm and fault relays (all SIL2 certified) for monitoring the ambient air to detect combustible gases and vapors within the lower explosive limit (LEL) by means of a catalytic sensor element (pellistor) or an infrared sensor element. The calibration of sensors without LCD display is carried out via the calibration device Cal PX or the PC software PC-Soft 80. Sensors with LCD display have an integrated calibration routine that is started from the outside by a permanent magnet without opening the housing. In case of an alarm or failure the backlight of sensors with LCD display changes from green to red. The gas sensor is sealed and thus the housing in zone 1 can be opened during operation at any time (Ex demb[ib]).

The PolyXeta®2 sensor is used in industrial areas like oil/gas industry, biogas plants, petrochemical industry, power plants etc. in Ex-Zone 1. The PolyXeta®2 sensor is also suitable for commercial areas like gas transfer stations etc. With the 4 – 20 mA / RS485-ModBus output signal the sensor is suitable for connection to the PolyGard®2 gas controller series by MSR-Electronic, as well as to any other controller or automation devices. Optionally, the PolyXeta®2 sensor is also available with LCD display and relay output.
 ATEX and IEC Ex certificates MSR-Electronic for electrical Ex protection
 ATEX metrical test & SIL2 safety functions 4 – 20 mA, RS485 and relay
 Type “Ex demb [ib]” for opening in Zone 1 without switching-off, pressure-resistant enclosure
 Continuous monitoring
 Microprocessor with 12 bit converter resolution
 Self-monitoring system
 Easy calibration, opening of the enclosure during operation possible (demb [ib]
 Calibration service by exchanging the sensor head
 Proportional 4 – 20 mA output
 Serial interface to the control center
 Reverse polarity protection