Wiring
Loop-powered display unit
18
Circuit diagram / Description
4-wire sensor with
process display unit and
loop power supply, with
backlighting
1
3
Y
I
2
4
LED
-
+
A0019571
1
HART
®
resistance
2
Current meter (optional)
3
Sensor
4
Power supply 4-wire device
Current output with
process display unit and
actuator (e.g. actuator
valve), without
backlighting
1
3
2
LED
-
+
A0019573
1
Actuator
2
Power supply 4-wire device
3
Current output
Current output with
process display unit and
actuator (e.g. actuator
valve), with backlighting
1
3
2
LED
-
+
A0019574
1
Actuator
2
Power supply 4-wire device
3
Current output
