Quick Installation Guide
00825-0100-4825, Rev CA
February 2006
Rosemount 248
S
TEP
5: P
ERFORM
A
L
OOP
T
EST
The Loop Test command verifies transmitter output, loop integrity, and
operation of any recorders or similar devices installed in the loop.
NOTE:
This is not available with the 248C Configuration Interface.
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 select 1) Device Setup, 2) Diag/Serv, 1)
Test Device, 1) Loop Test.
3. Select a discrete milliampere level for the transmitter to output. At
Choose Analog Output
select 1) 4mA, 2) 20mA or select 3) Other
to manually input a value between 4 and 20 milliamperes. Select
Enter
to show the fixed output. Select
OK
.
4. In the test loop, check that the fixed mA input and the transmitter’s
mA output are the same value. If the readings do not match, either
the transmitter requires an output trim or the current meter is
malfunctioning.
After completing the test, 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
.
00825-0100-4825.fm Page 13 Wednesday, February 8, 2006 1:53 PM
