Safety-related characteristics, 2 specific safety-related characteristics – KROHNE H250 M40 Safety V2 EN User Manual
Page 12
7
SAFETY-RELATED CHARACTERISTICS
12
H250 M40
www.krohne.com
06/2013 - 4000904202 MA H250 M40 SIL R02 en
7.2 Specific safety-related characteristics
Under the assumptions described in 7.1 and the definitions given in section 4 the following tables
show the failure rates according to IEC 61508:
H250/M40/K*-SK
H250/M40/K*-SK
H250/M40/K*-SK
H250/M40/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/K*-SK
H250/M40/K*-SK
H250/M40/K*-SK
H250/M40/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
50 FIT
10 FIT
38 FIT
61%
20%
487 years
SIL2
Stress profile 4
(high stress)
0 FIT
50 FIT
10 FIT
73 FIT
45%
12%
356 years
SIL1
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
1.82*E-04
3.46*E-04
8.41*E-04
λ
SD
λ
SU
λ
DD
λ
DU
SFF 2 DC
D
MTBF
SIL AC 3
Stress profile 2
(low stress)
0 FIT
81 FIT
10 FIT
77 FIT
54%
11%
376 years
SIL1
Stress profile 4
(high stress)
0 FIT
81 FIT
10 FIT
112 FIT
44%
8%
293 years
SIL1
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
3.68*E-04
7.02*E-04
1.70*E-03
MA_H250_M40_SIL2_R02_en_904202_PRT.book Page 12 Wednesday, June 26, 2013 9:04 AM