Pepperl+Fuchs KFD2-UT2 Series Sil Safety Manual

2011-09
10
SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Planning
2.4 Characteristic Safety Values
The following tables contain no data for the SFF, since this performance value has
to be calculated with consideration of the connected field device.
KFD2-UT2-(Ex)*
Parameters acc. to IEC 61508 Variables
Device type B
Demand mode Low Demand Mode
Safety function Transfer of analog value
HFT 0
SIL 2 (proven-in-use acc. to EN 61511)
λ
s
0 FIT
λ
dd
1
333 FIT
λ
du
2
79.2 FIT
λ
no effect
3
295 FIT
λ
total (safety function)
706 FIT
λ
no part
33.4 FIT
SFF 88.78 %
MTBF
4
154 years
PFD
avg
for T
1
= 1 year 3.74 x 10
-4
T
proof
max. 2 years
1
"Fail high" and "Fail low" failures are considered as dangerous detected failures λ
dd
.
2
Annunciation failure rates that only influence the diagnostic function were marginal and added to the λ
du
.
3
"No effect" failures are not influencing the safety functions and are therefore added to the λ
s
.
4
acc. to SN29500. This value includes failures which are not part of the safety function (MTTR = 8 h).
Ta b l e 2 . 1

Pepperl+Fuchs KFD2-UT2 Series Specifications

General

Brand	Pepperl+Fuchs
Model	KFD2-UT2 Series
Category	Media Converter
Language	English