Spectrex 20/20U (UB) - UV Flame Detector - Manual (Page 16)

Spectrex Inc. - SharpEye™ UV Flame Detector Manual – TM 20/20UB Rev. E, August 2004
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3.3 False Alarms
The detector does not provide an alarm or a warning signal as a reaction to the
radiation sources specified at Table 2 below.
Notes:
IAD = Immune at any distance.
All sources are chopped from 0 to 20 Hz.
Table 2. Immunity to False Alarm Faults
Radiation Source Immunity
Distance ft. (m)
Sunlight IAD
Indirect or reflected sunlight
IAD
Vehicle headlights (low beam) conforming to MS53023-1 IAD
Incandescent frosted glass light, 100W IAD
Incandescent clear glass light, rough service, 100W IAD
Fluorescent light with white enamel reflector, standard office
or shop, 40W (or two 20W) IAD
Bright colored clothing, including red and safety orange IAD
Red dome light conforming to M251073-1 IAD
Blue-green dome light conforming to M251073-1 IAD
Flashlight (Mx 991/U) IAD
Radiation heater, 1500W IAD
Radiation heater, 1000W with fan IAD
Lit cigar or cigarette 5ft. (1.5m)
Match, wood, stick including flare up 13.3ft. (4.0m)
Please Note : UV flame detectors are sensitive to false alarm from UV radiation
sources such transforms, motors, welding, spikes, etc. (That may be present in
the protected area or far away.)