Eaton Power Xpert C445 - Page 25

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