Performance Considerations - Emerson Rosemount 975MR Reference Manual

Introduction
August 2019
For further details, see the Certificate of Compliance No. UL-BR 16.065XX.
TR CU/EAC
The flame detector is in compliance with the standard TR CU 012/2011 per:
1Ex db eb op is IIC T4 Gb X
Ex tb op is IIIC T96 °C Db X
-55 °C ≤ Ta ≤ +75 °C
or
1Ex db eb op is IIC T4 Gb X
Ex tb op is IIIC T106 °C Db X
-55 °C ≤ Ta ≤ +85 °C
For more details, see TR CU certificate No. TC RU C-US MЮ 62.B05535.
1.5

Performance considerations

1.5.1 Detection sensitivity
Detection sensitivity is the maximum distance at which the detector reliably detects a
specific size of fire and typical type of fuel (standard fire).
Standard fire
Defined as 1 ft.
(2 m/sec).
Sensitivity ranges
The detector has four user-selectable sensitivity ranges. For each range, there are two
response levels:
•
Warning
•
Alarm
The detection distance for the Warning level is approximately 10 percent higher than the
Alarm
Alarm response times for a standard fire at a specified range are shown in
Table 1-4: Sensitivity Range Levels
Level
1
2 default
14
2 2
(0.1 m ) n-heptane pan fire with maximum wind speed of 6.5 ft./sec
(Pre-alarm)
distance.
Response time (sec)
3
5
Reference Manual
00809-0100-4975
Table 1-4.
Sensitivity range - ft. (m) (for
2 2
1 ft. (0.1 m ) n-heptane pan
fire)
50 (15)
100 (30)
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