Emerson Rosemount 975 Series, Reference Manual

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Sensitivity ranges
Note
All distances relate to detection of a 1 ft
2
(0.1 m
2
) n-heptane fire.
Table 7-5: Rosemount 975 Models
Rosemount 975MR Rosemount 975HR Rosemount 975UF Rosemount 975UR
Six ranges:
• 10 ft (3 m)
• 50 ft (15 m)
• 100 ft (30 m)
• 150 ft (45 m)
• 215 ft (65 m)
• 300 ft (90 m)
Three ranges:
• 10 ft (3 m)
• 50 ft (15 m)
• 92 ft (28 m)
Field of view
Table 7-6: Rosemount 975 Models
Rosemount 975MR Rosemount 975HR Rosemount 975UF Rosemount 975UR
Horizontal: 100°
Vertical: 95° Hydrogen
Horizontal: 90°
Vertical: 90° Horizontal: 100°
Vertical: 95°
Other fuels
Horizontal: 80°
Vertical: 80°
Temperature range (operating and storage)
Table 7-7: Rosemount 975 Models
Rosemount 975MR Rosemount 975HR Rosemount 975UF Rosemount 975UR
-76 °F (-60 °C) to 185 °F (85 °C)
Humidity
Non-condensing relative humidity up to 100 percent.
7.2 Electrical specifications
The electrical specifications apply to all models unless stated otherwise.
Operating voltage 24 Vdc nominal (18-32 Vdc)
Power consumption Standby: Max. 3 W (8 W with heated window)
Alarm: Max. 4.2 W (9.6 W with heated window)
Cable entries 2 x ¾ -in - 14 NPT conduits or 2 x M25 x 1.5 mm International
Organization for Standardization (ISO)
Reference Manual Specifications
00809-1400-4975 February 2022
Rosemount 975 33