Emerson Rosemount 248 Reference Manual page 38

Configuration
May 2019
3.4.7 Diagnostics and service
Test device
The Test Device command initiates a more extensive diagnostics routine than is
performed continuously by the transmitter. The Test Device menu lists the following
options:
• 1 Loop test verifies the output of the transmitter, the integrity of the loop, and the
operations of any recorders or similar devices installed in the loop. See
for more information.
• 2 Self Test initiates a transmitter self test. Error codes are displayed if there is a
problem.
• 3 Master Reset sends out a command that restarts and tests the transmitter. A master
reset is like briefly powering down the transmitter. Configuration data remains
unchanged after a master reset.
• 4 Status lists error codes. On indicates a problem, and Off means there are no
problems.
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:
Procedure
1. Connect a reference meter to the transmitter. To do so, shunt the transmitter
2. From the Home screen, choose 1 Device Setup, 2 Diag/Serv, 1 Test Device, 1 Loop
3. Choose a discreet milliampere level for the transmitter to output. At the Choose
4. Check the current meter installed in the test loop to verify that it reads the value
Master reset
Master Reset resets the electronics without actually powering down the unit. It does not
return the transmitter to the original factory configuration.
38
power through the meter at some point in the loop.
Test before performing a loop test.
prompt, choose 1 4mA, 2 20mA, or choose 3 other to manually
analog output
input a value between 4 and 20 mA.
that 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
another output value can be chosen.
Rosemount 248 Temperature Transmitter Reference Manual
Reference Manual
00809-0100-4825
Loop test below