WIKA T32.xS User Manual
Page 17
GB
17
WIKA safety manual temperature transmitter T32.xS
11583631.02 11/2010 GB/D/F/E
3.1 FMEDA Pt100 3-wire (safety function for 4 … 20 mA output)
2)
λ
du
30 FIT
1)
λ
dd
2037 FIT
1)
λ
su
+λ
sd
118 FIT
1)
SFF – Safe Failure Fraction
98.6 %
MTTR
8 h
PFD for T
proof
1 year
1.316 x 10
-4
DC proof-test-coverage
incl. signal conditioning chain
99 %
3.2 FMEDA Pt100 4-wire (safety function for 4 … 20 mA output)
λ
du
34 FIT
1)
λ
dd
2037 FIT
1)
λ
su
+λ
sd
119 FIT
1)
SFF – Safe Failure Fraction
98.6 %
MTTR
8 h
PFD for T
proof
1 year
1.482 x 10
-4
DC proof-test-coverage
incl. signal conditioning chain
99 %
3.3 FMEDA Pt100 2-wire (safety function for 4 … 20 mA output)
λ
du
414 FIT
1)
λ
dd
1657 FIT
1)
λ
su
+λ
sd
118 FIT
1)
SFF – Safe Failure Fraction
81.2 %
MTTR
8 h
PFD for T
proof
1 year
1.815 x 10
-3
DC proof-test-coverage
incl. signal conditioning chain
99 %
3.4 FMEDA
thermocouple with internal cold junction
(safety function for 4 … 20 mA output)
λ
du
265 FIT
1)
λ
dd
4807 FIT
1)
λ
su
+λ
sd
116 FIT
1)
SFF – Safe Failure Fraction
94.9 %
MTTR
8 h
PFD for T
proof
1 year
1.162 x 10
-3
DC proof-test-coverage
incl. signal conditioning chain
99 %
1) FIT = Failure in time, Unit: Quantity of failures per 10
9
h
2) Determine the distribution of error patterns in WIKA TRxx Sensors
Page 2/3
Appendix 1: SIL Declaration of Conformity
SIL Declaration of Conformity
Functional safety per DIN EN 61508 / DIN EN 61511