SE237 is a flammable gas detector with catalytic, pellistor,electrochemical or infrared  sensor, consisting of a housing,which contains the electrical circuit and the connection terminals. The sensor is inserted into the sensorholder at the bottom of the housing.

Specification:

IP Rating: IP65
No. 3 Alarm relays. MAX resistive load 24V/1A SPST
No. 1 Fault relay. MAX resistive load 24V/1A SPST
Alarm levels (relays) programmables via DIP-Switch
No. 1 linear 4÷20 mA current output
No. 5 LED shows the working conditions
(red: alarms; green: normal; yellow: fault)
Terminals plug-in polarized type