Spectrex 20/20R - Single IR Flame Detector - Manual (Page 15)

Spectrex Inc. - SharpEye TM Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
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3.3 False Alarms Prevention
The detector will not provide an alarm or a warning signal as a reaction to the
radiation sources specified below.
Notes:
IAD = Immune at Any Distance.
All sources are chopped from 0 to 20Hz.
Table 3: Immunity To False Alarm Sources
Immunity
Distance
Radiation Source
ft (m)
Incandescent frosted glass light, 100 W 1.7 0.5
Fluorescent light with white enamel reflector, standard office or
shop, 40 W (or two 20 W)
IAD
Arc welding [4 mm (5/32 in) rod; 240 A] 11.5 3.5
Halogen light 750W 16.5 5.5
Grinding metal 1.7 0.5
Lit cigar 3.3 1
Lit cigarette 1.7 0.5
Match, wood, stick including flare up 1.7 0.5