Mechanical Specifications - Emerson Rosemount 975 Series Reference Manual

Specifications
February 2022
Electrical input
protection
Electromagnetic
capability
Electrical interface
Electrical input protection
The input circuit is protected against voltage-reversed polarity, voltage transients, surges,
and spikes according to EN 54-10.
Outputs
Relays
Analog
0-20 mA
(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 5 °C to 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 °F (0 °C) and 95 °F
(35 °C). The detector stops heating the window when the temperature is 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 one percent), polyurethane painted
(1) Rosemount 975 flame detectors also have a low power heater option.
34
According to EN 50130
Electromagnetic interference/Radio frequency interference
(EMI/RFI) protected to EN61000-6-3 and EN 50130
The detector includes 17 terminals, one wiring option.
Alarm, fault, and auxiliary
SPST volt-free contacts rated 2A at 30 Vdc
5 V at detection, 0 V at fault, 2 V at normal
Fault: 0 +1 mA
Built-in test (BIT) Fault: 2 mA ± 0.3 mA
Normal: 4 mA ± 0.3 mA
Warning: 16 mA ± 0.3 mA
Alarm: 20 mA ± 0.3 mA
(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