Emerson Rosemount 2410 - Aappendix A: Parameters Related to the Safety Function; 5900 And 2410 (SIL 2, 1-In-1); 5900 And 2410 (SIL 3, 2-IN-1)

65
Safety Manual
00809-0200-5100, Rev GA
Parameters Related to the Safety Function
February 2017
Parameters Related to the Safety Function
Appendix A Parameters Related to the
Safety Function
A Failure Modes, Effects and Diagnostics Analysis (FMEDA) was conducted resulting in the
following failure rates.
A.1 5900 and 2410 (SIL 2, 1-in-1)
Failure rates for a Rosemount Tank Gauging Safety System consisting of a Rosemount 5900
Radar Level Gauge and a Rosemount 2410 Tank Hub (1oo1D) according to IEC 61508.
Table A-1. Failure rates according to IEC 61508
A.2 5900 and 2410 (SIL 3, 2-IN-1)
Table A-2. Failure rates according to IEC 61508
Failure Category Failure Rates (in FIT)
Fail Safe (
S
)
1117
Fail Dangerous Detected (
DD
)
0
Fail Dangerous Undetected (
DU
)
57
Safe Failure Fraction (SFF)
(1)
(1) The complete sensor subsystem will need to be evaluated to determine the overall Safe Failure Fraction.
The number listed is for reference only.
95.2 %
Random capability SIL 2
Systematic capability SIL 3
Failure Category
Failure Rates (in FIT)
Fail Safe (
S
)
1921
Fail Dangerous Detected (
DD
)
0
Fail Dangerous Undetected (
DU
)
17
Safe Failure Fraction (SFF)
(1)
(1) The complete sensor subsystem will need to be evaluated to determine the overall Safe Failure Fraction.
The number listed is for reference only.
99.0%
Random capability SIL 3
Systematic capability SIL 3