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Installation Guide
Current Sensors
H421/H421SP
Wiring
Scaling
Z201200-0G
Page 3 of 4
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Output is not polarity sensitive. 12-30 VDC external power needed.
Example 1: External Power
DDC
CONTROLLER
AI
Power Supply
Example 2: Powered by the controller
DDC
CONTROLLER
AI
V(COM)
4-20mA
20mA
SENSOR
OUTPUT
4mA
0
10 20 30 40 50 60 70 80 90
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