Appendix A Specifications And Reference Data; Technical Specifications; Electrical Specifications - Emerson Rosemount 975UF Reference Manual

Reference Manual
00809-0100-4977
A Specifications and reference data
A.1

Technical specifications

Table A-1: Technical Specifications
Spectral response UV: 0.185 to 0.260 µm
IR: 2.5 to 3.0 µm
Detection range (at Fuel
highest sensitivity
n-Heptane
2
setting for 1 ft. (0.1
2
m ) pan fire
Gasoline
Diesel fuel
JP5
LPG
IPA (isopropyl alcohol) 43 / 13
Polypropylene pellets
Response time Typically 3 seconds
High speed 20 msec response to flash fire
Adjustable time delay Up to 30 seconds
Sensitivity ranges 1 ft.
Fields of view Horizontal: 100 °, vertical: 90 °
Built-in test (BIT) Automatic (only)
(1) 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire
(2) 20 in. (0.5 m) high, 8 in. (0.2 m) wide plume fire
A.2

Electrical specifications

Operating voltage: 18 - 32 Vdc
Power consumption:
Table A-2: Electrical Specifications
Operating voltage
Power consumption
(max. 24 Vdc)
Maximum current
(max. 24 Vdc)
Rosemount 975UF
ft. / m
66 / 20
66 / 20
50 / 15
50 / 15
(1)
43 / 13
43 / 13
2 2
(0.1 m ) n-heptane pan fire from 65 ft. (20 m)
Table A-2
Status
Normal
Normal when heater
on
Alarm
Alarm when heater on
Normal
Specifications and reference data
Fuel m / ft
(1)
Hydrogen 37 / 11
(1)
Methane 26 / 8
Methanol 26 / 8
Ethanol 95% 2.5 / 7.5
Office paper 16 / 5
(2)
Silane 16 / 5
All outputs Without 0-20 mA
1.61 W 1.56 W
2.28 W 2.16 W
2.64 W 2.28 W
3.24 W 2.88 W
70 mA 65 mA
June 2021
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