Emerson Rosemount 975 Series, Reference Manual

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C Immunity to false alarm sources
Table C-1: Immunity to false alarm sources
IAD: Immunity at any distance
Radiation source Immunity distance
Rosemount
975MR Rosemount
975HR Rosemount
975UF Rosemount
975UR
Indirect or reflected sunlight IAD IAD IAD IAD
Vehicle headlights (low beam) conforming
to MS53023 IAD IAD IAD IAD
Incandescent frosted glass light, 300 W IAD IAD IAD IAD
Fluorescent light with white enamel
reflector, standard office or shop, 80 W (or
two 40 W) IAD IAD IAD IAD
Electric arc (15/32-in (12 mm)) gap at 4000
Vac, 60 Hz IAD IAD IAD IAD
Arc welding (5/16-in (6 mm)) rod, 210 A See Table C-2 .
Ambient light extremes (darkness to bright
light with snow, water, rain, desert glare, or
fog) IAD IAD IAD IAD
Bright colored clothing, including red and
safety orange IAD IAD IAD IAD
Electronic flash (180 W seconds minimum
output) IAD IAD IAD IAD
Movie light, 625 W quartz DWY lamp
(Sylvania S.G. 55 or equivalent) >6.5 ft (2 m) >6.5 ft (2 m) >13 ft (4 m) >3 ft (1 m)
Blue green dome light conforming to
M251073 IAD IAD IAD IAD
Flashlight (MX 991/U) IAD IAD IAD IAD
Radiation heater, 3000 W >3 ft (1 m) >3 ft (1 m) IAD IAD
Radiation heater, 1000 W with fan IAD IAD IAD IAD
Quartz lamp (1000 W) >3 ft (1 m) >3 ft (1 m) See Table C-3 .
Mercury vapor lamp IAD IAD IAD IAD
Grinding metal IAD IAD IAD IAD
Lit cigar >1 ft (0.3 m) >1 ft (0.3 m) IAD IAD
Lit cigarette >1 ft (0.3 m) >1 ft (0.3 m) IAD IAD
Match, wood, stick, including flare up >20 ft (6 m) >10 ft (3 m) >7 ft (2 m) >7 ft (2 m)
Vehicle exhaust diesel fume
For Rosemount 975MR only IAD IAD N/A N/A
Reference Manual Immunity to false alarm sources
00809-1400-4975 February 2022
Rosemount 975 41