Perform A Loop Test - Emerson Rosemount 644 Quick Start Manual

Quick Start Guide
Step 5: Perform a loop test
The Loop Test command verifies transmitter output, loop integrity, and
operation of any recorders or similar devices installed in the loop.
Performing a loop test using a Field Communicator
Initiate a loop test
1. Connect an external ampere meter in series with the transmitter loop (so the
power to the transmitter goes through the meter at some point in the loop).
2. From the home screen, enter the Fast Key sequence.
Device dashboard Fast Keys
3. In the test loop, check that the transmitter's actual mA output and the HART
mA reading are the same value. If the readings do not match, either the
transmitter requires an output trim or the meter is malfunctioning. After
completing the test, the display returns to the loop test screen and allows the
user to choose another output value.
4. To end the Loop Test, select End and Enter.
Performing a loop test using AMS Device Manager
1. Right click on the device and select Service Tools.
2. In the left navigation pane select Simulate.
3. On the Simulate Tab in the Analog Output Verification group box, select the
Perform Loop Test button.
4. Follow the guided instructions and select Apply when complete.
Performing a loop test using the Local Operator Interface
Reference the figure below to find the path to the Loop Test in the LOI menu.
Figure 7. Configuring the Tag with LOI
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February 2015