TC · Edition 08.17 48
Technical data
7.6 Safety-specific characteristic values
For systems up to SIL 3 pursuant to EN 61508
Mains and control voltage: 120 V AC/230 V AC
Diagnostic coverage DC 91.4%
Mean probability of dangerous failure PFH
D
17.3 x 10
-9
1/h
Mains voltage: 120 V AC/230 V AC, control voltage: 24 V DC
Diagnostic coverage DC 91.3%
Mean probability of dangerous failure PFH
D
17.2 x 10
-9
1/h
Mains and control voltage: 24 V DC
Diagnostic coverage DC 91.5%
Mean probability of dangerous failure PFH
D
17.5 x 10
-9
1/h
General
Mean probability of dangerous failure
PFH
D
Auxiliary valves with valve block on
TC 3: 0.2 x 10
-9
1/h
Type of subsystem Type B to EN 61508-2
Operating mode
High demand mode pursuant to
EN 61508-4
Continuous operation (to EN 1643)
Mean time to dangerous failure
MTTF
d
1/PFH
D
Safe failure fraction SFF 97.5%
Pursuant to EN ISO 138491, Table 4, TC 1, TC 2 and
TC 3 can be used up to PL e.
Relationship between the Performance Level (PL)
and the Safety Integrity Level (SIL)
PL SIL
a –
b 1
c 1
d 2
e 3
Max. service life under operating conditions:
10 years after date of production.
For a glossary of terms, see page 53 (Glossary).
For further information on SIL/PL, see www.k-sil.de
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