Safety-related characteristics – KROHNE H250 M40 Safety V1 EN User Manual
Page 17
SAFETY-RELATED CHARACTERISTICS
7
17
H250 M40
www.krohne.com
02/2012 - 4000904201 MA H250 M40 SIL R01 en
H250/M40/ESK-SE
H250/M40/ESK-SE
H250/M40/ESK-SE
H250/M40/ESK-SE with 4..20 mA current output and screwed
screwed
screwed
screwed process connections
H250/M40/HT/ESK-SE
H250/M40/HT/ESK-SE
H250/M40/HT/ESK-SE
H250/M40/HT/ESK-SE with 4..20 mA current output and screwed
screwed
screwed
screwed 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
233 FIT
317 FIT
137 FIT
80%
70%
148 years
SIL1
Stress profile 4
(high stress)
0 FIT
261 FIT
331 FIT
172 FIT
77%
66%
133 years
SIL1
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
6.62*E-04
1.26*E-03
3.04*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
243 FIT
317 FIT
157 FIT
78%
67%
142 years
SIL1
Stress profile 4
(high stress)
0 FIT
273 FIT
331 FIT
212 FIT
74%
61%
126 years
SIL1
T[Proof] 4
1 year
2 years
5 years
PFD
AVG
5
7.57*E-04
1.44*E-03
3.48*E-03
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
.
MA_H250_M40_SIL2_R01_en_904201_PRT.book Page 17 Thursday, March 1, 2012 10:08 AM