Model FL3102
8
Reaching the Earth
Sun's Radiation
Visible Region
Wavelength
4.35um
Sensitivity
Spectral
IR Detector's
Infrared Region
2.2 Principle of Operation
2.2.1 IR Flame Detector
The Model FL3102 is a discriminating Dual Frequency Infra-Red Detector, which
makes use of Infrared detectors for different IR wavelengths and characteristics.
This combination provides a flame detection system, which is highly immune to
false alarms.
Incorporated in the IR circuitry is a flicker discrimination circuit. This permits the
detector to ignore steady static IR sources such as hot objects. The inherent
flickering of a flame provides the necessary modulation to activate the IR circuit.
The Model FL3102 Flame Detector processes these IR signals with a
microcomputer and produces the following outputs:
•
0 to 20 Milliampere signal.
•
Immediate WARN relay contacts.
•
Time delayed ALARM relay contacts.
•
FAULT relay contacts.
•
RS- 485 MODBUS RTU output.
•
Optional: Redundant RS- 485 Modbus RTU output.
(See Sections 3 & 4 for more information on detector outputs.)
Figure 15 Spectral Response of IR Detectors