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Installation Guide
Current Sensors
H421/H421SP
Calibration
(H421 Only)
Troubleshooting
Z201200-0G
Page 4 of 4
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The following calculation is given as an example and uses
sample current values. In an actual application, any values
appropriate to the application (within the range of the device)
can be substituted.
The H421SP is factory-calibrated.
1. Set Zero.
Apply power to the sensor with no load
in the monitored conductor. Turn the
zero setpoint screw until the controller
reads 4 mA output.
2. Calculate the maximum and target readings.
A. Determine the maximum current likely to occur in the application.
B. Establish normal load conditions on the conductor. Measure this current using
an external measurement device, such as a portable amp clamp.
C. Calculate target output:
If A = the max. current, and B = the reading from the amp clamp, then:
B
target output =
16 mA x — + 4 mA
A
1200
16 mA x — + 4 mA
e.g. target output =
1600
3. Set Span.
Turn the span setpoint screw until the controller reading equals the target output.
Problem
No Reading at Controller
• Confirm that a 12-30 VDC power supply is in series with the sensor output terminals and the control
panel analog input terminals.
• Assure that sensor core mating surfaces are clean and that the core clamp is completely closed.
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Span
1000 2400
Zero
Out
Zero
OK!
A
= 16 mA
Span
1000 2400
Zero
Out
1000
2400
Solution
.com
0A
0A
Controller:
4mA Output =
0A Load
1600 A
1200 A
1200 A
1200 A
Controller:
16 mA Output
= 1200 A Load
06132
sales@GlobalTestSupply.com
TM
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