3
Operating the detector
This chapter describes how to power up and test the detector. It also includes some very
important safety checks that you should make before operating the detector.
3.1
Power up
Follow these instructions carefully to obtain optimal performance from the detector over
its life cycle.
To power up the detector:
Procedure
1. Turn on the power.
2. Wait approximately 60 seconds for the detector to finish the startup procedure.
Applying power initiates the following sequence of events:
•
The yellow LED flashes at 4 Hz.
•
Built-in test is executed.
If successful, the green LED flashes at 1 Hz, and the FAULT relay contacts close; mA
output is 4 mA.
3. Enter Normal mode.
NOTICE
The majority of detectors are used in the default non-latching alarm mode. Only
perform a reset when the latching alarm option has been programmed.
To reset the detector when it is in a Latched Alarm state, do one of the following:
•
Disconnect power (terminal number 1 or terminal number 2).
•
Initiate a manual built-in test.
3.2
Safety precautions
After powering up, the detector requires almost no attention in order to function properly,
but note the following:
•
Follow the instructions in this Reference Manual and refer to the drawings and
specifications.
•
Do not expose the detector to radiation of any kind unless required for testing
purposes.
•
Do not open the detector housing while power is applied.
•
Do not open the electronic compartment. Keep this part closed at all times. It can only
be opened in the factory. Opening the electronic component side invalidates the
warranty.
Reference Manual
Operating the detector
00809-0100-4975
August 2019
Rosemount 975MR
39
