Reliable methane detection in ATEX zones

The PolyXeta^®2 PX2 gas detector by MSR for the ATEX zone is used for detecting methane leakage. The microprocessor-based gas sensor with output signal as well as alarm and fault relays (all SIL2 certified) monitors the ambient air for combustible gases and vapours using an infrared sensor element or a catalytic sensor element (pellistor). Analogue signal values (4–20 mA), such as measured values and alarm activation, are sent to the DCS (Distributed Control System). The digital signal of the detector is sent to the ventilation cabinet to activate additional fans and to shut down the air chambers.

The 4–20 mA / RS-485 Modbus output signal makes the sensor suitable for connection to the PolyGard®2 gas controller series from MSR-Electronic, as well as to other controllers or automation devices from MSR. As an option, the PolyXeta^®2 sensor is also available with LCD and relay output.

Sensors with LCD have an integrated calibration routine that is started from the outside by means of a permanent magnet without opening the housing.

In the event of an alarm or error, the backlight changes from green to red. The calibration of sensors without LCD display is carried out via the handy MSR calibration device STL06-PGX2 or the PC software PCE06-PGX2.