WIKA T32. S Serie Manual De Seguridad página 17

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