Emerson Rosemount 975MR Reference Manual page 18

Introduction
August 2019
Table 1-6: Immunity to False Alarm Sources
Radiation source
Electric arc (15/32 in. [12 mm] gap at 4,000 Vac,
60 Hz)
Arc welding (5/16 in. [6 mm] rod; 210 A)
Ambient light extremes (darkness to bright light
with snow, water, rain, desert glare, and fog)
Bright colored clothing, including red and safety
orange
Electronic flash (180 W-seconds minimum
output)
Movie light, 625 W quartz DWY lamp (Sylvania
S.G. - 55 or equivalent)
Blue-green dome light conforming to
M251073-1
Flashlight (MX 99 I/U)
Radiation heater, 3,000 W
Radiation heater, 1,000 W with fan
Quartz lamp (1,000 W)
Mercury vapor lamp
Grinding metal
Lit cigar
Lit cigarette
Match, wood, stick, including flare up
1. IAD: Immune at any distance.
2. All sources are chopped from 0 to 20 Hz.
Table 1-7: Welding Immunity Distance
Sensitivity setting
1
2
3
4
1.5.4 Visual indicators
One three-color LED indicator is located inside the detector window, as shown in
1-3. The detector statuses are listed in
18
(continued)
Immunity distance ft. (m)
IAD
See Table 1-7
IAD
IAD
IAD
> 6.5 (2)
IAD
IAD
> 3 (1)
IAD
> 3 (1)
IAD
IAD
> 1 (0.3)
> 1 (0.3)
> 13 (4)
Detection range
50 ft. (15 m)
100 ft. (30 m)
150 ft. (45 m)
215 ft. (65 m)
Table 1-8.
Reference Manual
00809-0100-4975
Immunity distance
> 6 ft. (2 m)
> 12 ft. (4 m)
> 17 ft. (6 m)
>25 ft. (7.5 m)
Figure
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