Determined Safety Characteristics - Knick ProLine P22400 Mode D'emploi

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Determined Safety Characteristics

To determine the safety characteristics, the following assumption is made:
Ambient conditions correspond to an average industrial environment.
Safety Integrity Level (SIL) according to EN 61508:2010 or
Performance Level (PL) according to EN ISO 13849-1:2008
Load ≤ 700 Ω
Characteristic Value
Demand mode High/Low
Device type A
Operating
4 ... 20 mA
mode
103.2 FIT 1)
λ total
λ S 101.7 FIT
λ D 1.5 FIT
λ DU 1.5 FIT
λ SD 0 FIT
λ DD 0 FIT
SFF 98.6 %
0 % (no diagnostics) 2)
DC
221 years 3)
MTTF D
CAT 1 (1oo1) or 3 (1oo2)
PL c (1oo1) or e (1oo2)
SIL 3
MTTR 72 h max. time to repair
Temperature Max. 40 °C
PFH/PFD Values
PFD 1oo1
PFH 1oo1
(1/h)
PFD 1oo2
PFH 1oo2
(1/h)
T 1 =1 a
6.6 x 10 -6
(0.7 %)
1.5 x 10 -9
(1.5 %)
6.6 x 10 -7
(0.06 %)
1.5 x 10 -10
(0.15 %)
T 1 = Time interval between the functional tests of the safety function
% values in brackets = proportion of maximally permitted PFD or PFH value for SIL 3.
SIL Safety Manual
Explanation
High/Low demand mode
Total failure rate
Rate of safe failures
Rate of dangerous failures
Rate of dangerous undetected failures
Rate of safe detected failures
Rate of dangerous detected failures
Fraction of non-hazardous failures
Mean operating time until dangerous failure
Category according to EN 13849-1
Performance level according to EN 13849-1
Safety integrity level according to EN 61508
Replacing a defective device by a replace-
ment device of the same model
Long-time average temperature
T 1 =2 a
1.3 x 10 -5
(1.3 %)
1.5 x 10 -9
(1.5 %)
1.3 x 10 -6
(0.13 %)
1.5 x 10 -10
(0.15 %)
T 1 =3 a
2 x 10 -5
(2 %)
1.5 x 10 -9
(1.5 %)
2 x 10 -6
(0.2 %)
1.5 x 10 -10
(0.15 %)