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Reference Manual
00809-0100-4021, Rev DA
November 2004
3-23
Rosemount 3144P
HART
Loop Test
The Loop Test command verifies the output of the transmitter, the integrity of
the loop, and the operations of any recorders or similar devices installed in the
loop. To initiate a loop test, perform the following procedure:
1. Connect an external ampere meter to the transmitter. To do so, shunt
the power to the transmitter through the meter at some point in the loop.
2. From the HOME screen, select 1 Device Setup, 2 Diag/Serv, 1 Test
Device, 1 Loop Test before performing a loop test. Select OK after you
set the control loop to manual. The communicator displays the loop test
menu.
3. Select a discreet milliampere level for the transmitter to output. At the
CHOOSE ANALOG OUTPUT prompt, select 1 4mA, 2 20mA, or select
4 Other to manually input a value between 4 and 20 milliamperes. Select
Enter. It will indicate the fixed output. Select OK.
4. Check the installed transmitter in the test loop to verify that it reads the
value that it was commanded to output. If the readings do not match,
either the transmitter requires an output trim or the current meter is
malfunctioning.
After completing the test procedure, the display returns to the loop test screen
and allows the user to choose another output value. To end the Loop Test,
Select 5 End and Enter. The Test device screen will appear.
The transmitter can simulate alarm conditions based on the transmitter’s
current hardware and software alarm configurations.
To initiate Simulation Alarm, perform the following procedure:
1. From the Home screen, select 1 Device Setup, 2 Diag/Serv, 1 Test
Device, 1 Loop Test, 3 Simulate Alarm.
2. Based on the chosen alarm conditions, the transmitter will display an
alarm.
3. To return the transmitter to normal conditions, select 5 End.
AMS
Right click and select “Diagnostics and Calibration.” Choose “Test” and
select “Loop Test.” The loop test wizard will walk through the process to fix
the output for either sensor 1 or 2.
The transmitter must be returned to normal conditions (turn off loop test)
before placing back in process
Right click and select “Diagnostics and Calibration.” Choose “Test” and
select “Loop Test.” The loop test wizard will walk through the process to fix
the analog output. From the loop test wizard screen choose “END.” A
message will appear indicating that it is OK to return to normal.
HART Fast Keys 1, 2, 1, 1