In-Service Troubleshooting - Emerson Fisher 846 Instruction Manual

Instruction Manual
Form 5739
February 2002
TROUBLESHOOTING
FROM THE
CONTROL ROOM
NOTE:
AFTER FINAL CORRECTIVE ACTION, CHECK LOOP OPERATION.
IF NOT OK, RESTART TROUBLESHOOTING PROCEDURE.
1 REFER TO REPLACING THE MODULE FINAL ASSEMBLY
IN SECTION 6.
C0789/IL
The Remote Pressure Reading (RPR)
frequency signal has an amplitude of
0.4 to 1.0 V peak-to-peak. If other
noise (frequency) with a comparable
or greater amplitude is present on the
line, it may make the RPR frequency
signal unreadable.
Figure 5-5. Field Troubleshooting Flowchart
Note
Troubleshooting

In-service Troubleshooting

A number of simple checks can be made on the
transducer while the unit is in service. Figure 5-5
shows a troubleshooting flowchart.
1. Make sure that the module cover is tight. The
cover should be hand-tightened and then advanced
1/4 to 1/2 turn (24 to 27 NSm) (18 to 20 lbfSft).
TROUBLESHOOTING
IN THE
FIELD
5–3