Model FL3102
9
2.2.2 COPM Circuitry
A self- testing feature called Continuous Optical Path Monitoring (COPM) checks
the optical path, the detector(s), and the related electronic circuitry once every
minute. If foreign material impairs the optical path of the infrared detector for two
consecutive checks, the unit will indicate FAULT. The optical FAULT outputs are
a 2.0 mA signal, de-energizing of the FAULT relay, and RS-485 output signal
(see Section 3.4 Terminal Connections). After a COPM FAULT, a COPM check
is performed every ten seconds until the obstruction is removed. Then the COPM
check will resume a once per minute check.
WARNING –
Dirty or partially blocked windows can significantly reduce the
detectors field of view and detection distance.
NOTE –
Since the optical path is checked once per minute and it requires two
check failures to produce a FAULT, it may take up to two minutes for the unit to
detect an obstruction.
2.2.3 Alarm Test
The Model FL3102 Flame Detector has a built-in Alarm Test feature. By
connecting one contact of a SPST momentary switch to TB1 position 4 and the
other contact to DC COM (see Section 3.4 Terminal Connections), the user can
test the alarm outputs of the Flame Detector by activating this switch for one to
eight seconds depending on the Alarm Delay Setting. The Flame Detector will
immediately go into WARN and then into the time delayed ALARM.
After one to eight seconds the Flame Detector will activate the ALARM. A
latching WARN and/or ALARM will remain latched until manually reset.
2.2.4 Visual Indicators
Two light emitting diodes (LED’s) are visible through a window. LED’s are
provided for a visual indication that corresponds with the detectors’ outputs. The
following blinking sequence indicates the operation condition:
•
Time out (10 seconds when the unit is first powered) - Green and red LED’s
blinking alternately.
•
Ready - Green LED that flashes off 1 second, every 10 seconds.
•
WARNing - Slow blinking red LED with green LED on steady.
•
ALARM - Fast blinking red LED with green LED on steady.
•
COPM FAULT - Slow blinking green LED.
•
Low Volt age FAULT - Fast blinking green LED.