Procedure
Refer to the sensor and transmitter installation manuals for grounding requirements and
instructions.
10.12 Perform loop tests
A loop test is a way to verify that the transmitter and the remote device are
communicating properly. A loop test also helps you know whether you need to trim mA
Outputs.
Prerequisites
• Follow appropriate procedures to ensure that loop testing will not interfere with
existing measurement and control loops.
10.12.1 Perform loop tests using ProLink III
Prerequisites
Before performing a loop test, configure the channels for the transmitter inputs and
outputs that will be used in your application.
Follow appropriate procedures to ensure that loop testing will not interfere with existing
measurement and control loops.
Procedure
1. Test the mA Output(s).
a. Choose Device Tools > Diagnostics > Testing > mA Output Test.
b. Enter 4 in Fix to:.
c. Click Fix mA.
d. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
e. Click UnFix mA.
f. Enter 20 in Fix to:.
g. Click Fix mA.
h. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
i. Click UnFix mA.
Troubleshooting
Configuration and Use Manual 139
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