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Description
FL500 UV/IR Flame Detector
US
Fig. 2 FL500 UV/IR Flame Detector
The FL500 is compatible with the General Monitors TA402A trip amplifier, FL802 controller, and other
equipment that accepts 4 - 20 mA output. The device can be connected directly with alarm and
suppression devices or switched input modules through integral relays. If the HART protocol is used
with the FL802 controller, it is necessary to use the special HART signal (1.25 - 20 mA).
2.2 Continuous Optical Path Monitoring (COPM)
COPM does a check of the device's optical path (from the internal UV and IR detectors through an air
gap then the optical window) and related electronic circuitry every 2 minutes. If the optical window is
blocked by unwanted objects such as ice, dirt, or debris for two consecutive checks, the device acti-
vates the following Fault output:
• 2.0 mA signal
• Fault relay de-energizes
• Modbus signal
After a COPM Fault occurs, COPM occurs every 30 seconds until the Fault condition is removed.
When the Fault condition is removed, COPM continues every 2 minutes.
Refer to Section 5.2 "Cleaning the Optical Window" for maintenance instructions.
Because the FL802 controller is not CE marked, it cannot be supplied to the European
Union (EU).
Because COPM does a check of the optical path every 2 minutes and two consecutive
checks must fail before a Fault occurs, it can be up to 3 minutes before the device iden-
tifies a blockage.
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