Spectrex 20/20R - Single IR Flame Detector - Manual (Page 10)

Spectrex Inc. - SharpEye TM Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
2
2. Technical Description
• Detection Range: up to 50ft (15m) for a 1ft x 1ft (0.3m x 0.3m) fire.
• Field Programmable Sensitivity: two ranges.
• Two Response Levels: Warning & Detection.
• Microprocessor Based: Digital signal processing.
• Built In Test: Manual and Automatic (see section. 4.2.2).
• Electrical Interface:
o
Dry contact RELAYS.
o
Communication network RS-485.
o
4-20mA output.
• Certification: Approved by ATEX.
2.1 Principles Of Operation
The Single IR flame detector provides early warning of flaming fires involving
organic (hydrocarbon fuels and vapours) materials. These fires emit strong IR
radiation in the 4.4-micron spectral band where the CO
2
(main combustion product
of any organic substance) has a unique spectral peak.
This detector contains a “state-of-the-art” infrared sensor and optical filter that
provides maximum sensitivity of the CO
2
emission spectral band at 4.4 micron.
The detector is designed to withstand “harsh” environment conditions, including
extreme temperature, high humidity, vibrations, etc.
Figure 1: IR Flame Detector