Spectrex 20/20F - Fast UV/IR Flame Detector - Manual (Page 9)

Spectrex Inc. - SharpEye TM UV/IR (F) Flame Detector Manual – TM756100 Rev A, July 2005
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2.3 Detection Levels
Simultaneous detection of radiation in both the UV and the IR channels having
an intensity, which exceeds detector’s preset Alarm level, will result in an Alarm
signal.
Simultaneous detection of radiation in both the UV and the IR channels having
an intensity which exceeds detector’s preset Flash-Fire Detection level will result
in an immediate Alarm signal, regardless of the detector mode setting selected.
Since the preset dual range and level of radiation, as well as the flickering
pattern, are characteristic of real fire, all other radiation sources apart from actual
fire will not be detected, thus avoiding false alarms.
2.4 Detector Structure
Figure 1 shows an outline drawing of the Flame Detector Assembly.
Figure 2 shows a schematic section of the internal Flame Detector, and
describes its main components.
2.5 System Configuration
The Spectrex model 20/20F is a self-contained Optical Flame Detector that can
function as a stand alone unit directly connected to external devices as alarm
systems or automatic fire extinguishing systems. The same detector can form
part of a more complex system where a plurality of detectors and other devices
are integrated through a dedicated control unit.
2.6 Detector Type
The 20/20F is available in 4 models:
20/20F-C
Fast UV/IR Flame Detector in Aluminum Housing
20/20F-C-ST Fast UV/IR Flame Detector in St.St. Housing
20/20FE-C Fast UV/IR Flame Detector “de” Version in Aluminum Housing
20/20FE-C-ST Fast UV/IR Flame Detector “de” Version in St.St. Housing
2.7 Product Marking
The 20/20F Optical Flame Detector is certified to:
ATEX EXII 2G per
SIRA 00ATEX 1161, EExd IIB + H
2
T5 Amb. Temp. = -40°C to +70°C and
SIRA 00ATEX 1165, EExde IIB + H
2
T5 Amb. Temp. = -40°C to +70°C
The detectors suitable for use in hazardous zones 1 and 2 where groups IIB + H
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gases and vapor are present.