Spectrex 20/20MU - Mini Flame Detector - Manual (Page 37)

Spectrex Inc. - SharpEye TM ML & MU Flame Detector Manual – TM 767100, Rev. A, April 2005
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7. Operating Instructions
7.1 Scope
The following instructions are designed to obtain optimal performance from the
detector over its life cycle.
7.2 Power-Up
1 Apply power and wait approximately 60 seconds for the automatic self-test of
the detector.
Note: Applying power initiates the following sequence:
- the LED flashes (4 Hz) yellow.
- BIT is executed, if successful then:
- LED flashes (1 Hz) green,
- FAULT relay contacts close
2 Wiring Inspection: If a short-circuit or line discontinuity exists, indications will
appear on the control unit display panel. Review your wiring.
3 The detector goes into its FAULT state when supply voltage drops below
16.5V. The detector status goes back to NORMAL, when the supply voltage is
above 17.5V.
4 Detector Inspection: Visually inspect the viewing window of the detector. It
should be clean and clear.
• LED should flash (1 Hz) green
• ALARM relays should be N.O
• FAULT relay should be N.C
• The 4-20mA Output should be 4mA.
5 If any of the outputs or indications is different from the description in step 4,
see paragraph 8.6 for troubleshooting.
The Flame Detector is now ready for Functional Testing.
7.3 Reset (only when optional ‘latching’ alarm has been selected)
To RESET a detector when in its ALARM state, disconnect power, or initiate a
manual BIT.
7.4 Functional testing
Following is a testing procedure for proper functioning of the detector. The
detector can be tested using the Manual Built-in-Test or the Spectrex Fire
Simulator - 20/20-311