Performing Transmitter Tests; Verifying Alarm Level; Performing An Analog Loop Test - Emerson Rosemount 2088 Reference Manual

Section 2: Configuration
March 2014
2.9

Performing transmitter tests

2.9.1

Verifying alarm level

If the transmitter electronics board, sensor module, or LCD display/LOI display is repaired or
replaced, verify the transmitter alarm level before returning the transmitter to service. This is
useful in testing the reaction of the control system to a transmitter in an alarm state. Thus
ensuring the control system recognizes the alarm when activated. To verify the transmitter
alarm values, perform a loop test and set the transmitter output to the alarm value (see
Table
Note
Before returning transmitter to service, verify security switch is set to the correct position. Refer
to "Verify configuration" on page
2.9.2

Performing an analog loop test

The Analog 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. It is recommended
that the 4-20 mA (1-5 Vdc) points in addition to alarm levels when installing, repairing, or
replacing a transmitter.
The host system may provide a current measurement for the 4-20 mA (1-5 Vdc) HART output. If
not, connect a reference meter to the transmitter by either connecting the meter to the test
terminals on the terminal block, or shunting transmitter power through the meter at some
point in the loop. For 1-5V output, voltage measurement is directly measured from Vout to (-)
terminals.
Performing a analog loop test using a field communicator
From the HOME screen, enter the Fast Key sequence
Device Dashboard Fast Keys
Performing a analog loop test using AMS Device Manager
1. Right click on the device and, within the Methods drop down menu, move cursor over
Diagnostics and Test. In the Diagnostics and Test drop down menu select Loop Test.
2. Click Next after setting the control loop to manual.
3. Follow Screen prompts to perform a Loop Test.
4. Select Finish to acknowledge the method is complete.
Performing analog loop test using a local operator interface
To perform an analog loop test using the LOI, the 4mA (1 V), 20mA (5V), and custom mA point
may be set manually. Reference
loop test using an LOI.
24
2-4, 2-5, and 2-6 on page 20, and "Verifying alarm level" on page
12.
3, 5, 1
Figure 2-14 for instructions on how to perform a transmitter
Reference Manual
00809-0100-4108, Rev BA
24).
Configuration