Chapter 3 Operation; Power Up The Detector; Test Flame Detectors - Emerson Rosemount 975 Series Reference Manual

Reference Manual
00809-1400-4975
3 Operation
3.1

Power up the detector

This section describes how to turn on the detector.
Procedure
After connecting the detector to power, wait up to 60 seconds for the detector to
completed the initial start-up procedure.
Note
Turning on the detector initiates the following sequence of events:
a. The yellow LED flashes at 4Hz.
b. BIT is executed.
c. BIT completes.
d. Detector enters normal mode, indicated by:
3.2

Test flame detectors

You can use the Rosemount flame simulators to test the Rosemount 975 flame detectors.
You can also use the manual built-in text (BIT) to test the flame detectors.
Table 3-1: Flame Simulator Compatibility
Rosemount flame simulator model
FS-HR-975
FS-IR-975
FS-UVIR-975
To test a flame detector:
Procedure
1. Power up the system and wait for up to 60 seconds for the detector to return to
2. Ensure all indicators show Normal.
Rosemount 975
• Flashing green LED at 1Hz
• Fault relay contacts closing
• mA output is 4mA (for models featuring analog [voltage] output, this will be 2V)
normal status.
The Power light-emitting diode (LED) turns on.
See Power up the detector.
Rosemount 975 flame detector model
975HR
975MR
975UF and 975UR
Operation
June 2021
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