User Documentation

112555600000/02/05-2018
Technical safety values
Safety basic data
Safety category SIL 3
Safety standard EN 61508
Device type A
HFT 2
T
proof
in years 12
Safety parameters “low demand mode”
Frequency of demands 5 per year
λ
DD
in FIT 0
λ
DU
in FIT 0.4
λ
SD
+ λ
SU
in FIT 1936.2
λ
Total
in FIT 1936.6
SFF in % 50
PFD
avg
(complete) 4.30 × 10
-6
MTTF in years 400
Safety parameters “high demand mode”
Frequency of demands Once per month Once per week Once per day
λ
DD
in FIT 0 0 0
λ
DU
in FIT 0.8 3.00 21.1
λ
SD
+ λ
SU
in FIT 1936.6 1938.8 1956.9
λ
Total
in FIT 1937.4 1941.9 1978.0
SFF in % 50 50 50
PFH in h
-1
(complete) 1.02 × 10
-10
2.14 × 10
-10
1.12 × 10
-9
MTTF in years 396 379 279
Requirements
• The maximum allowable ambient temperature is
50 °C.
• The environmental conditions correspond to the
average industrial environment.
6 Technical safety values
• The specications in the data sheet and the oper-
ating instructions should not be exceeded.