Gas sensor for methane, for gas leak/smoke detector GRM 61188

Semi-conductor gas sensor in plastic housing for gas and smoke detector GRM.
To be used in dry rooms (e. g. heating systems).
Detectable gases: methane, propane, butane.
The operating and alarm status of the gas warning system is optically
indicated at the sensor by a LED:
-LED green - operation
-LED yellow - error
-LED red - gas alarm
Every sensor must be calibrated for the corresponding gas type.
Technical data:
For flammable gases and smoke in the ambient air
Measuring range: 0 to 50 % lower explosion threshold
Measuring principle: semiconductor (life expectancy approx. 5 years -
depending on operating conditions)
Temperature range: 0°C to +40°C
Humidity: max. 75 % relative humidity
Design: wall housing made of plastic
Dimensions (H x W x D): 80 x 80 x 35 mm
Weight: approx. 100 g