Spectrex 20/20CTIN-CTIP Flame Detector - Manual (Page 12)

Spectrex Inc. - SharpEye TM CCTV Model Flame Detector Manual – TM 788100, Rev. A January 2005
4
After careful investigation, three channels were selected which, when operating
jointly, provide optimal fire detection characteristics:
Channel 1
: 4.2 µ - 4.6 µ
Fire - the CO
2
peak
Channel 2
: 4.0 µ - 4.2 µ
Eliminates false alarms from high temperature sources.
Channel 3
: 4.8 µ - 5.2 µ
Eliminates false alarms from flickering of background radiation.
Most IR sources, which create misleading IR alarm stimuli, including the sun,
incandescent and halogen lamps, electric arc discharges, electrical heaters, etc.,
do not possess this unique spectral signature of fire. The IR sensors of the
detector respond only to flickering of radiation signals. The signals are compared
to a predetermined threshold. Processing of the results from the three IR channels
is performed by the board microprocessor. The result is a much greater detection
distance and a highly increased ability to distinguish between fire and false alarms.
This sophisticated technology surpasses all other existing flame detection
techniques on the market today.
This unique flame analysis capability (patent pending) has been
incorporated into the Triple-IR fire detector manufactured by Spectrex, Inc.
The result is a unique flame detector, which does not produce false alarms
and provides at the same time detection over greatly increased distances.
Figure 1: CCTV Model Flame Detector