Characteristic Safety Values - Pepperl+Fuchs KFD2-CD-1.32 Series Manual

Functional Safety KFD2-CD-(Ex)1.32-**
Planning
3.4

Characteristic Safety Values

Parameters
Assessment type and
documentation
Device type
Mode of operation
Safety function
HFT
SIL (hardware)
1
+ 

sd su

dd

du

total (safety function)
1

no effect
2

fail high
1
SFF
PTC
3
MTBF
PFH
PFD for T = 1 years
avg 1
PFD for T = 3 years
avg 1
PFD for T = 5 years
avg 1
4
Reaction time
Table 3.2
1
"No effect failures" and "No part failures" are not influencing the safety function and are therefore not included in the SFF calculation
of the safety function.
2
May be used if too high output values are detected by the field device, see chapter 3.2.
3
acc. to SN29500. This value is valid for the safety function of the device/MTTR = 8 h.
4
Time between fault detection and fault reaction
The characteristic safety values like PFD, SFF, HFT and T
the SIL report/FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
12
Characteristic values
Full assessment
A (only hardware)
Low demand mode, high demand mode or continuous mode
Transfer of analog signals from
the input to the output with a
deviation of less than 2 %, current
driver function.
0
2
0 FIT
92 FIT
47.6 FIT
139.6 FIT
110 FIT
24.8 FIT
65.90 %
100 %
278 years
-8
4.76 x 10 1/h
-4
2.08 x 10
-4
6.25 x 10
-3
1.04 x 10
< 50 ms
Transfer of analog signals from the
to the output with a deviation of less
than 2 %, voltage driver function.
0 FIT
97.1 FIT
48.3 FIT
145.4 FIT
102 FIT
28.2 FIT
66.81 %
100 %
265 years
-8
4.83 x 10 1/h
-4
2.11 x 10
-4
6.34 x 10
-3
1.06 x 10
are taken from
1
are related to each other.
1
).
1