Spectrex 40/40L-LB UV/IR Flame Detector Series - Manual (Page 23)

TM 40/40L, Rev (6) February 2013
Performance Considerations 11
1.5.3 False Alarms Prevention
To prevent false alarms, the detector will not alarm or react to the radiation
sources specified in Table 4.
Table 4: Immunity to False Alarm Sources
Radiation Source
Immunity
Distance ft. (m)
Indirect or reflected sunlight IAD
Vehicle headlights (low beam) conforming to
MS53023-1
IAD
Incandescent frosted glass light, 300 W IAD
Fluorescent light with white enamel reflector, standard
office or shop, 70 W (or two 35 W) IAD
Electric arc [12mm ( 15 /
32
") gap at 4000 V alternating
current, 60 Hz]
IAD
Arc welding [6 mm ( 5 /
16
") rod; 210 A] 9.8 (3)
Ambient light extremes (darkness to bright light with
snow, water, rain, desert glare and fog)
IAD
Bright colored clothing, including red and safety
orange
IAD
Electronic flash (180 watt-seconds minimum output) IAD
Movie light, 625 W quartz DWY lamp (Sylvania S.G.-55
or equivalent)
>6.5 (2)
Blue-green dome light conforming to M251073-1 IAD
Flashlight (MX 991/U) IAD
Radiation heater, 3000 W IAD
Radiation heater, 1000 W with fan IAD
Quartz lamp (1000 W) 12 (4)
Mercury vapor lamp IAD
Grinding metal 3.3 ft. (1)
Lit cigar IAD
Lit cigarette IAD
Match, wood, stick including flare up 3.3 ft. (1)
Notes:
 IAD = Immune at Any Distance.
 All sources are chopped from 0 to 20 Hz.