Endress+Hauser RTA421 - Alarm Set Point Relay Connection; Connecting Alarm Relays

3.3.2 Transmitters with passive current output using the loop
power supply from the unit.
3.4 Connecting alarm set point relays
The contact condition shown is in a set point alarm condition or power failure.
Current input with loop power supply
Relay 1
Relay 2
Contactor
30