Eaton Power Xpert C445 Safety Manual page 25

Symbol
Safety Integrity Level
SIL
Hardware Fault
HFT
Tolerance
Failure rate for detected
ʎ
SD
safe failures
Failure rate for ʎ
SU
undetected safe failures
Failure rate for detected ʎ
DD
dangerous failures
Failure rate for
ʎ
DU
undetected dangerous
failures
Safe Failure Fraction SFF
Mean Time Before MTBF
Failure
Average probability of
PFD
failure on demand
Architecture
Lifetime
Proof Test Interval
Systematic capability
Symbol
Safety Integrity Level SIL
Hardware Fault HFT
Tolerance
Failure rate for detected ʎ
SD
safe failures
Failure rate for
ʎ
SU
undetected safe failures
Failure rate for detected
ʎ
DD
dangerous failures
Failure rate for ʎ
DU
undetected dangerous
failures
Safe Failure Fraction
SFF
Mean Time Before
MTBF
Failure
Average probability of PFD
failure on demand
Architecture
Lifetime
Proof Test Interval
Systematic capability
C445MA-005A
C445MA-032A
C445MA-045A
C445MC-136A
C445MC-090A
1
0
0.497909
(1)
(2) 0.587863
(3) 0.002574
(4) 0.366131
74.8%
490094
3.687 X 10
-07
AVG
1oo1
20 Yrs
1 Yr
1
C445MA-005P
1
0
(1) 0.487028
(2) 0.58784
0.002574
(3)
(4) 0.364931
74.7%
496113
3.675 X 10
-07
AVG
1oo1
20 Yrs
1 Yr
1
C445MA-2P4V
C445MA-005V
C445MA-032V
C445MC-045V
C445MC-136V
C445MC-090A
1
0
0.471086
0.281383
0.002574
0.208771
78.3%
708045
2.113 X 10
-07
1oo1
20 Yrs
1 Yr
1
C445XX-E
1
0
0.3172
0.1826
0.038
0.1805
74.8%
3055842
2.185 X 10
-07
1oo1
20 Yrs
1 Yr
1
Safety Manual MN042004EN March 2017 www.eaton.com
Safety Figures
C445MA-005I C445MA-2P4P
C445MA-045I
1 1
0 0
0.460205 0.487028
0.281361 0.58784
0.002574 0.002574
0.207571 0.364931
78.2% 74.7%
720677 796069
2.101 X 10 3.675 X 10
-07
1oo1 1oo1
20 Yrs 20 Yrs
1 Yr 1 Yr
1 1
C445XX-P
1
0
0.4231
0.0201
0.0348
0.1796
72.7%
1520334
2.145 X 10
-07
1oo1
20 Yrs
1 Yr
1
-07
19