15
Model FL4000H
2.3 Applications
The FL4000H provides flame detection for a wide range of applications, including, but not limited to
the following:
Table 2: Sample Industry Applications
Industries
Sample Applications
Oil and Gas
On and Offshore Platforms
Gas Pipelines
Compressor Buildings
Airports / Military
Airplane Hangars
Gas Turbines
Turbine Enclosures
Chemical Plants
Process Buildings
Loading Terminals
Trucking On / Off Loading Areas
Petrochemical
Process Areas
Refineries
Tank Farms and Process Areas
2.4 Principle of Operation
The FL4000H is a discriminating multi-spectral infrared detector, which makes use of infrared
sensors for different IR wavelengths and characteristics. This combination provides a flame
detection system, which is highly immune to false alarms.
The ANN network classifies the output signals from the detector as either fire or no-fire. The unit
then produces the following output signals:
0 to 20 mA signal (3.5 or 1.25 to 20 mA with optional HART protocol)
Immediate WARN relay contacts
Time delayed ALARM relay contacts
FAULT relay contacts
RS-485 Modbus output
Redundant RS-485 Modbus output
(Refer to Section 3.0 and Section 4.0 for more information on detector outputs.)
2.4.1 Visual
Indicators
Two light emitting diodes (LEDs) are visible on the front detector window. These LEDs provide a
visual indication that corresponds with the detector’s outputs. The following LED flashing
sequences indicate various operating conditions:
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