8
2 General Safety Instructions
2.5
Additional Components
The safety parameters do not include external components such as burner controls or any oth-
er sensors and actors.
2.6
Safety Values
The safety values have been determined by the use of a FMEDA with the following basic con-
ditions:
•
Component failure rates based on Siemens standard SN 29500, DIN EN 13611: 2011-12
and B10d values of manufactures where no other values are available.
•
Specific load parameters, quality factors and an ambient temperature of 60 °C have been
used for the calculation.
•
Failure models from DIN EN 13611 and additionally failure model drift have been used.
Under special circumstances short circuits have not to be assumed.
•
Estimation of common cause factors
β
= 2%
β
D
= 1%.
•
The "Proof test interval" T
1
is equivalent to the product mission or life time.
•
The calculation of the safety probability values has been done with a lifetime of 10 years
1
.
•
For redundant structures a diagnostic test interval of T2 = 120s has been defined.
•
For redundant subsystems (HFT>=1) the SFF is > 90%, for subsystems without
redundancy (HFT=0) the SFF is > 99%
•
The F200K is designed as one safety unit (PES). There is no separation within the
F200K electronic between safety and non safety related components by architectural
design.
•
There is no difference between
λ
s
detected and undetected. All safe failures can be
assumed as safe undetected (
λ
su
).
1
See chapter
for more information.
Summary of Contents for F200K2 IR-1
Page 1: ...www lamtec de Sensors and Systems for Combustion Engineering Safety Manual F200K...
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Page 18: ...17 7 Appendix 7 Appendix 7 1 T V Confirmation...
Page 19: ...18 7 Appendix...
Page 21: ...20 8 EU Declaration of Conformity 8 EU Declaration of Conformity...
Page 22: ...21 8 EU Declaration of Conformity...
