Spectrex 20/20SH - Hydrogen Flame Detector - Manual (Page 15)

Spectrex Inc. - SharpEye TM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005
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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
Radiation Source Immunity
Distance ft(m)
Sunlight IAD
Indirect or reflected sunlight
IAD
Vehicle headlights (low beam) conforming to MS53023-1 IAD
Vehicle IR lights (low beam) conforming to MS53024-1 IAD
Incandescent frosted glass light, 100 W IAD
Incandescent clear glass light, rough service, 100 W IAD
Fluorescent light with white enamel reflector, standard office or
shop, 40 W (or two 20 W) IAD
Electric arc [12mm (15/32 in) gap at 4000 V alternating current,
60 Hz] IAD
Arc welding [4 mm (5/32 in) rod; 240 A] See Table 4
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)
Red dome light conforming to MS51073-1 IAD
Blue-green dome light conforming to M251073-1 IAD
Flashlight (MX 991/U) IAD
Radiation heater, 1500 W IAD
Radiation heater, 1000 W with fan IAD
Quartz lamp (1000 W) 10 (3)
Mercury vapor lamp IAD
Grinding metal IAD
Lit cigar 1 (0.3)
Lit cigarette 1 (0.3)
Match, wood, stick including flare up 10 (3)
Table 4: Welding Immunity Distance
SW setting Detection Range Immunity Distance
1 16 ft (5m) >13 ft (4m)
2 33 ft (10m) >20 ft (6m)
3 66 ft (20m) >30 ft (9m)
4 100 ft (30m) >40 ft (12m)