76
Reference Manual
00809-0100-4140, Rev AA
January 2017
5.4.4
Analog loop test (optional)
This test verifies the analog output of the level detector, the integrity of the loop, and the
operations of any recorders or similar devices installed in the loop.
It is recommended that the 4-20 mA points, in addition to alarm levels, are verified when
installing, repairing, or replacing a level detector.
The host system may provide a current measurement for the 4-20 mA HART output.
If not, connect a reference meter (ammeter) to the level detector by either connecting the
meter to the test terminals on the terminal block, or shunting level detector power through
the meter at some point in the loop.
This loop test simulation temporarily overrides the analog output with a fixed level of
current. Options are:
4 mA
20 mA
Simulate alarm
Other (custom mA)
Note
Simulations are canceled by exiting a screen. They also be cleared by a power re-cycle or
device reset. See
“Configuring alarm and saturation levels” on page 33
to review output
current levels for alarms.
To start the loop test (Field Communicator)
1.
From the Home screen, select
3: Service Tools
.
2.
Select
5: Simulate
>
1: Loop Test
.
3.
Select from the loop test options (e.g. 4 mA) to start the simulation.
Note
When messages about the loop appear, take appropriate safe action and select “OK”.
See
“Configuration basics” on page 10
for further information.
To start the loop test (AMS Device Manager)
1.
Right click on the device and select
Service Tools
.
2.
Select
Simulate
.
3.
Click on
Loop Test
.
4.
Follow on-screen instructions to select a loop test and start the simulation.
Fast Keys
3, 5, 1
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