Appendix Esil-2 Features; Safety Relevant Parameters; Guidelines For Configuring, Installing, Operating, And Service - Emerson Rosemount 975MR Reference Manual
Multi-spectrum infrared flame detector
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Reference Manual
00809-0100-4975
E
SIL-2 features
This appendix details the special conditions to comply with the requirements of EN 61508
for SIL 2.
The Rosemount 975MR Flame Detector can only be used in low or high demand mode
applications; see IEC 61508.4, Chapter 3.5.12.
E.1
Safety relevant parameters
Perform the following functional checks of the detector.
•
Alternative 1: Functional check of the detector every 180 days:
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•
Alternative 2: Functional check of the detector every 365 days:
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E.2
Guidelines for configuring, installing,
operating, and service
The alert conditions according to SIL-2 can be implemented by an:
•
Alert signal via 20 mA current loop
or
•
Alert signal via alarm relay and the fault relay
E.2.1
Conditions for safe operating
1. The flame detector shall consist only of the approved hardware and software
2. The 24 V power supply must fulfill the requirements for PELV/SELV of EN 60950.
3. The automatic BIT (built-in test) must be activated.
Rosemount 975MR
HFT: 0
-4
PFD: 3.0 x 10
(≈ 3% of SIL-2) if only alarm relay is used for alerting.
-4
PFD: 3.2 x 10
(≈ 3.2% of SIL-2) if 0-20 mA interface is used as alarm.
-7
PFH: 1.5 x 10
1/h (≈14.9% of SIL-2) for 0-20 mA application.
SFF: 95% fulfills the conditions of EN 61508 for SIL-2.
HFT: 0
-4
PFD: 4.5 x 10
(≈ 4.5% of SIL-2) if only alarm relay is used for alerting.
-4
PFD: 4.9 x 10
(≈ 4.9% of SIL-2) if 0-20 mA interface is used as alarm.
-7
PFH: 1.5 x 10
1/h (≈14.9% of SIL-2) for 0-20 mA application.
SFF: 95% fulfills the conditions of EN 61508 for SIL-2.
modules.
SIL-2 features
August 2019
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