Mechanical Specifications - Emerson Rosemount 975 Series Reference Manual

Specifications
June 2021
Outputs
Relays
Analog
0-20mA
(stepped)
Heated optics
The front window can be heated to improve performance in ice, condensation, and snow
conditions. The heater increases the temperature of the optical surface by 41–77 °F (5–25
°C) above the ambient temperature
Off
On
Auto (default) Operated only when the change of temperature requires the heating
Note
In auto mode, the starting heat temperature can be defined between 32–95 °F (0–35 °C).
The detector stops heating the window when the temperature is 27 °F (15 °C) above the
start temperature.
7.3

Mechanical specifications

Enclosure options
Stainless steel 316 with electropolish finish
Heavy duty copper free aluminum (less than 1%), polyurethane painted
Tilt mount
Stainless steel 316 with electropolish finish
Detector dimensions
4 x 4.6 x 6.18 inches (100.6 x 117 x 155 mm)
Weight
Stainless steel detector: 6.3 lb (2.9 kg)
Aluminum detector: 2.8 lb (1.3 kg)
Tilt mount 2.5 lb (1.1 kg)
(1) Rosemount 975 flame detectors also have a low power heater option
28
Alarm, fault, and auxiliary
SPST volt-free contacts rated 2A at 30 VDC
5V at detection, 0v at fault, 2v at normal
Fault: 0 +1mA
BIT fault: 2mA ± 0.3mA
Normal: 4mA ± 0.3mA
Warning: 16mA ± 0.3mA
Alarm: 20mA ± 0.3mA
(1)
. The heated optics can be configured in three ways:
Optics are not heated
Optics are continuously heated
Reference Manual
00809-1400-4975
Emerson.com/Rosemount