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Functional Safety SJ2-SN, SJ3,5-S(1)N
Planning
To ensure the safety of the safety loop according to SIL 3, only use control units
for SIL 3 safety applications from Pepperl+Fuchs, i. e. switch amplifier KFD2- SH-Ex1.
Reaction Time
The reaction time for all safety functions is < 1 ms.
Note
See corresponding datasheets for further information.
3.4
Characteristic Safety Values
Parameters
Assessment type and
documentation
Device type
Mode of operation
HFT
Safety function
SIL (SC)
2
s
du
total (safety function)
SFF
PFH
PFD
for T
= 1 year
avg
1
PFD
for T
= 2 years
avg
1
PFD
for T
= 5 years
avg
1
MTTF
d
Useful life time
3
Reaction time
Table 3.2
1
For the proven-in-use demonstration, sales figures, customer returns and questionnaires filled out by customers were used
which show that no unknown systematic faults are expected. The device is based on a former device that was evaluated
for a proven-in-use statement by exida.com GmbH.
2
"No effect" failures are not influencing the safety functions and are therefore included into the safe failures.
3
Step response time, also valid under fault conditions (including 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
Characteristic values
FMEDA report with proven-in-use assessment
A
Low Demand Mode or High Demand Mode
0
High impedance state, depending on the position of the measuring plate
2 (3)
in combination with a control unit
according to EN 60947-5-6 (NAMUR)
15.3 FIT
9.7 FIT
25.0 FIT
61.3 %
-9
9.67 x 10
1/h
-5
4.24 x 10
-5
8.47 x 10
-4
2.12 x 10
11800 years
20 years
< 1 ms
1
3
in combination with a control unit
for SIL 3 safety applications from
Pepperl+Fuchs, i. e. switch amplifier
KFD2-SH-Ex1
24.9 FIT
0.09 FIT
25.0 FIT
99.64 %
-11
9 x 10
1/h
-7
3.94 x 10
-7
7.88 x 10
-6
1.97 x 10
are taken from
1
are related to each other.
1
).
1
13
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