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3 limitations of ir-ir flame detectors, 4 advantages of ir3 technology, Limitations of ir-ir flame detectors – Spectrex 20/20MPI - Commercial IR3 Flame Detector User Manual

Page 16: Advantages of ir3 technology

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IR3 Flame Detector User Guide

4

Principles of Operation

2.2.3 Limitations of IR-IR Flame Detectors

CO2 in the atmosphere attenuates the radiation in this spectral band.
(Absorption and emission of radiation always occur in the same band.) As a
result, the greater the distance between the detector and the fire, the
weaker the intensity of the radiation reaching the detector (the CO2
attenuation increases). This phenomenon explains the limitations of the
existing IR-IR flame detectors in the market:

Detection distance is restricted to 33 ft. (10 m) only.

Their immunity to false alarm sources is limited.

2.2.4 Advantages of IR3 Technology

To overcome these limitations, Spectrex Inc. devised an innovative concept
of utilizing an additional detection channel. Three channels collect more data
from the environment, permitting more accurate analysis and better
performance.

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 CO2 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.

Note: 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 detection over greatly increased distances at the same time.