Safety-related characteristics – KROHNE H250 M40 Safety V1 EN User Manual
Page 13
SAFETY-RELATED CHARACTERISTICS
7
13
H250 M40
www.krohne.com
02/2012 - 4000904201 MA H250 M40 SIL R01 en
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK with 1 or 2 fail-safe limit switches
fail-safe limit switches
fail-safe limit switches
fail-safe limit switches (MIN/MAX) 1 and welded
welded
welded
welded
process connections
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK
H250/M40/HT/K*-SK with 1 or 2 standard limit switches
standard limit switches
standard limit switches
standard limit switches (MIN/MAX) 6 and welded
welded
welded
welded
process connections
λ
SD
λ
SU
λ
DD
λ
DU
SFF 2 DC
D
MTBF
SIL AC 3
Stress profile 2
(low stress)
0 FIT
177 FIT
10 FIT
58 FIT
76%
14%
432 years
SIL2
Stress profile 4
(high stress)
0 FIT
219 FIT
10 FIT
114 FIT
66%
8%
308 years
SIL2
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
2.77*E-04
5.29*E-04
1.28*E-03
λ
SD
λ
SU
λ
DD
λ
DU
SFF 2 DC
D
MTBF
SIL AC 3
Stress profile 2
(low stress)
0 FIT
208 FIT
10 FIT
97 FIT
69%
9%
342 years
SIL2
Stress profile 4
(high stress)
0 FIT
250 FIT
10 FIT
152 FIT
63%
6%
260 years
SIL2
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
4.63*E-04
8.84*E-04
2.15*E-03
1 The switching contact output is connected to a fail-safe NAMUR amplifier (e.g.
Pepperl+Fuchs KF**-SH-Ex1). The failure rates of the amplifier are not included in the
listed failure rates.
2 The number listed is for reference only. The SFF must be determined for the complete
subsystem.
3 SIL AC (architectural constraints) means that the calculated values are within the range
for hardware architectural contraints for the corresponding SIL level.
4 It is assumed that proof testing is performed with a proof test coverage of 99%.
5 The PFD
AVG
was calculated for profile 2 using the Markov modelling. The results must be
considered in combination with PFD
AVG
values of other devices of the Safety Instrumented
Function (SIF) in order to determine suitability for a specific Safety Integrity Level (SIL)
For SIL1 applications, the PFD
AVG
value needs to be < 10
-1
.
For SIL2 applications, the PFD
AVG
value needs to be < 10
-2
.
6 The switching contact output is connected to a standard NAMUR switching amplifier (e.g.
Pepperl+Fuchs KF**-SR2-Ex*.W). The failure rates of the amplifier are not included in the
listed failure rates.
MA_H250_M40_SIL2_R01_en_904201_PRT.book Page 13 Thursday, March 1, 2012 10:08 AM