1 POWER 2 ALARM 3 FAILURE D1 CH4 %UEG 0,00 1 32 = Ackn. button Heavy Duty PCB Status LEDs Ackn.-/ Testbutton S r vi c e T ool St a tus LED A c k n. But t on S ensor head Sensor Heavy Duty PCB Status LED s Ackn.-/Test but ton = Ackn. but ton Fault relays( y) ene gized in ope rating mode at No ala rm - Default A larm relays( relay) de-energized