Emerson Rosemount 975 Series, Reference Manual

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Potential cause
Faulty detector.
Recommended action
Re-power the detector.
6.4 Light-emitting diode (LED) constantly red,
alarm relay energized, 0-20 mA indicates alarm
Potential cause
Existing alarm condition.
Recommended action
Check cause of alarm.
Potential cause
Alarm latched.
Recommended action
Ensure the alarm latch is not enabled in the detector settings.
Potential cause
Faulty detector.
Recommended action
Re-power the detector.
6.5 No HART
®
communication, 0-20 mA shows 0
mA
Potential
No HART is available at 0 mA level.
Recommended action
For Fault mode, the default indication is 1 mA. Configure this to 0 mA.
Emerson does not recommend this when using a HART connection in order to
preserve the HART communication.
Troubleshooting Reference Manual
February 2022 00809-1400-4975
30 Emerson.com/Rosemount