General Monitors FL3112, Руководство пользователя

Страница: 8 / 41

Model FL3112
3
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, depending on the version, a 2.0
mA signal or de-energizing of the FAULT relay. The FAULT status is available via the RS-
485 serial communications port. (
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 checking once per minute.
WARNING – A dirty or partially blocked lens can significantly reduce the detector’s 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.
Alarm Test
The Model FL3112 Flame Detector has a built-in Alarm Test feature. This test may be
activated via the serial communications port (
see Section 3-4 Terminal Connections ).
The Flame Detector will immediately go into WARN and then into the time delayed
ALARM. After two to ten seconds the Flame Detector will activate the ALARM. A latching
WARN and/or ALARM will remain latched until reset.
Visual Indicators
Two light emitting diodes ( LEDs ) are visible through the window. LEDs are provided for a
visual indication that corresponds with the detectors’ outputs. The following blinking
sequence indicates the operating condition:
•
Timeout (2 minutes when the unit is first powered) – Green and red LEDs blinking
alternately.
•
Ready – Green LED that flashes off 1 second, every 5 seconds.
•
WARNing – Slow blinking red LED.
•
ALARM – Fast blinking red LED.
•
COPM FAULT – Slow blinking green LED.
•
Low Voltage FAULT – Fast blinking green LED.