Setra System Model 231RS - Manual (Page 10)

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3.2 Electrical Termination
Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero
Model 231RS when configured for voltage output is a 3-wire circuit device with three terminals available for wiring.
The -Excitation and -Output are commoned on the circuit.
Model 231RS can operate from 15-30 VDC (18-30 VAC) nominal output power supply.
Note: The Zero terminals, connected to digital output, provide a contact closure relay for automatic reset to zero pres-
sure by the monitoring system.
CAUTION: ZERO input is for dry contact, do no apply voltage to ZERO Terminals
The optional remote zero is a normally open relay wired between COM and REMOTE ZERO terminals. In order to initi-
ate ZERO function the relay contact should be closed.
DC/AC
Power Supply
Controller
Voltage
+
+
Relay
Figure 5