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A
B
C
D
– EXCITATION
+ EXCITATION
Gauge
Connector
Typical 4-20 mA Circuit
4-20 mA
CURRENT
LOOP
E
F
– EXCITATION
+ EXCITATION
Gauge
Connector
Typical 0-5 VDC Circuit
+
SUPPLY
VOLTAGE
+ OUTPUT
– OUTPUT
Typical 4-20 mA Circuit with Open Collector Alarms
R = 250 ohm for 1-5 V output
L
R = 500 ohm for 2-10 V output
L
DO NOT EXCEED 750 OHMS WITH 24 VDC SUPPLY.
NOTE: Alarm loads may be relay coils as shown below.
Connect 1 A 400 V diodes to protect from relay "kick".
Alarm 2
Alarm 1
To + Power
Gauge
Connector
Controller
Process
L
R
+Vin
A
B
C
D
E
F
A
B
C
D
E
F
4-20mA Loop
*Any voltage up
to 60 VDC @
160 mA max.
Alarm
Loads
(Optional but recommended
for surge protection)
+
Gnd
Alarm 1
Dig Gnd
Alarm 2
DC* Power
Supply
-
-Excitation
+Excitation
Process
Controller
L
R
+Vin
DPG10L M3367/0606
8