Pepperl+Fuchs KFD2-STC4-Ex Series User Manual

2014-09
12
Safety Manual SIL KFD2-ST*4-(Ex)*, KFD2-CR4-(Ex)*
Planning
KFD2-CR4-(Ex)2, KFD2-STC4-(Ex)2, KFD2-STC4-(Ex)2-3, KFD2-STC4-(Ex)2-Y*,
KFD2-STV4-(Ex)2-1, KFD2-STV4-(Ex)2-2
The characteristic safety values like PFD, PFH, SFF, HFT and T
proof
are taken
from the SIL report/FMEDA report. Please note, PFD and T
proof
are related to
each other.
The function of the devices has to be checked within the proof test interval
(T
proof
).
Parameters acc. to IEC 61508 Values
Assessment type FMEDA report
Device type A
Demand mode Low Demand Mode or High Demand Mode
Safety function
2
Transfer of analog values
HFT 0
SIL 2

s
165 FIT

dd
1
111 FIT

du
36 FIT

no effect
2
165 FIT

not part
111 FIT

total (safety function)
312 FIT
SFF 88 %
MTBF
3
269 years
PFH 3.60 x 10
-8
1/h
PFD
avg
for T
proof
= 1 year 1.58 x 10
-4
PFD
avg
for T
proof
= 2 years 3.15 x 10
-4
PFD
avg
for T
proof
= 5 years 7.88 x 10
-4
1
"Fail high" and "Fail low" failures are considered as dangerous detected failures 
dd
.
2
"No effect" failures are not influencing the safety functions and are therefore added to the 
s
.
3
acc. to SN29500. This value includes failures which are not part of the safety function.
Table 2.4
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Pepperl+Fuchs KFD2-STC4-Ex Series Specifications

General

Brand	Pepperl+Fuchs
Model	KFD2-STC4-Ex Series
Category	Power Supply
Language	English