WIKA T32. S Serie Manual De Seguridad página 18

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