Troubleshooting - Emerson Rosemount 975UF Reference Manual

Maintenance and troubleshooting
June 2021
Functional test procedure
Perform a functional test of the detector as described in
4.1.3 Keeping maintenance records
Emerson recommends that you record maintenance operations performed on a detector
in a log book. The record should include the following:
• Installation date and contractor
• Serial and tag number
• Entries for every maintenance operation performed, including the description of the
operation, date, and personnel ID
If you send a unit to Emerson or a distributer for service, include a copy of the maintenance
records.
4.2

Troubleshooting

This section is intended to be a guide to correct problems that may happen during normal
operation.
4.2.1 Fault relay at N.O.
LEDs off
0-20 mA at 0 mA
Potential cause
No power to the unit.
Recommended actions
4.2.2 Fault relay at N.O.
Yellow/amber LED flashes at 4 Hz.
0-20 mA at 0 mA
Potential cause
Detector fault
• Low voltage
• Faulty detector
46
1. Check that the correct power is sent to the detector.
2. Check power polarity.
3. Check wiring in the detector.
4. Send the detector back for repairs.
Reference Manual
00809-0100-4977
Internal detector tests.
Emerson.com/Rosemount