Basic configuration:

 

Sensors for methane (natural gas), propane-butane, ammonia, ethylene, fuel vapors, organic dissolvent vapors and others, two independent channels, two alarm levels for each channel with 5A/250V SPDT relay outputs, relay output for sensor or cable failure, 220V power supply, dimensions 160x166x102 mm, wall mountable, protection IP65. Work whit transmitters series DGS510.

Additional - back-up power supply - 12V