Spectrex 20/20SI Triple IR (IR3) Flame Detector - Manual (Page 31)

Spectrex Inc. - SharpEye TM IR3 Flame Detector Manual – TM 20/20I, Rev. (6) August 2004
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6. Installation Instructions
6.1 Scope
The "Spectrex" Model 20/20I is a self-contained Optical Flame Detector, designed
to operate as a stand-alone unit directly connected to alarm systems or automatic
fire extinguishing systems. The detector can form part of a more complex system
where many detectors and other devices are integrated through a common control
unit. This chapter does not attempt to cover all of the standard practices and
codes of installation. Rather, it emphasizes specific points of consideration and
provides some general rules for qualified personnel. Wherever applicable, special
safety precautions are stressed.
6.2 General Considerations
Very Important
The detector should be aimed toward the center of the detection zone and
have a completely unobstructed view of the protected area. Whenever
possible, the detector face should be tilted down at a slight angle to prevent
the accumulation of dust and dirt. Do not start an installation unless all
conceivable considerations regarding detector location have been taken into
account.
To ensure optimal performance and an efficient installation, the following
guidelines should be considered:
A. Sensitivity
To determine the level of sensitivity (SW1), the following issues should be
considered:
• Size of fire at determined distance to be detected.
• Type of flammable materials.
B. Spacing and Location
The number of detectors and their locations in the protected area are
affected by:
• Size of the protected area
• Sensitivity of the detectors
• Obstructed lines of sight
• Cone of view of the detectors
C. Environment
• Dust, snow or rain can reduce the detectors sensitivity and require
more maintenance activities.
• The presence of high intensity flickering of IR sources may affect
sensitivity.