WIKA T32.xS User Manual
Page 18
GB
18
11583631.02 11/2010 GB/D/F/E
WIKA safety manual temperature transmitter T32.xS
3.5 FMEDA
thermocouple with external cold junction
(safety function for 4 … 20 mA output)
λ
du
664 FIT
1)
λ
dd
6407 FIT
1)
λ
su
+λ
sd
118 FIT
1)
SFF – Safe Failure Fraction
90.7 %
MTTR
8 h
PFD for T
proof
1 year
2.91 * 10
-3
DC proof-test-coverage
incl. signal conditioning chain
99 %
3.6 FMEDA duplex sensor Pt100 (safety function for 4 … 20 mA output)
λ
du
57 FIT
1)
λ
dd
4017 FIT
1)
λ
su
+λ
sd
119 FIT
1)
SFF – Safe Failure Fraction
98.8 %
MTTR
8 h
PFD for T
proof
1 year
2.495 * 10
-4
DC proof-test-coverage
incl. signal conditioning chain
99 %
3.7 FMEDA duplex sensor thermocouple with internal cold junction
(safety function for 4 … 20 mA output)
λ
du
516 FIT
1)
λ
dd
9557 FIT
1)
λ
su
+λ
sd
117 FIT
1)
SFF – Safe Failure Fraction
95.3 %
MTTR
8 h
PFD for T
proof
1 year
2.262 * 10
-3
DC proof-test-coverage
incl. signal conditioning chain
99 %
1) FIT = Failure in time, Unit: Quantity of failures per 10
9
h
Appendix 1: SIL Declaration of Conformity
SIL Declaration of Conformity
Functional safety per DIN EN 61508 / DIN EN 61511
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