Spectrex 20/20R - Single IR Flame Detector User Manual
Page 15
Spectrex Inc. - SharpEye
TM
Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
7
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