KROHNE H250 M40 Safety V2 EN - Manual (Page 13)

SAFETY-RELATED CHARACTERISTICS
7
13
H250 M40
www.krohne.com 06/2013 - 4000904202 MA H250 M40 SIL R02 en
1 The switching contact output is connected to a fail-safe NAMUR amplifier (e.g.
Pepperl+Fuchs KF**-SH-Ex1). The failure rates of the amplifier are not included in the
listed failure rates.
2 The number listed is for reference only. The SFF must be determined for the complete
subsystem.
3 SIL AC (architectural constraints) means that the calculated values are within the range
for hardware architectural contraints for the corresponding SIL level.
4 It is assumed that proof testing is performed with a proof test coverage of 99%.
5 The PFD
AVG
was calculated for profile 2 using the Markov modelling. The results must be
considered in combination with PFD
AVG
values of other devices of the Safety Instrumented
Function (SIF) in order to determine suitability for a specific Safety Integrity Level (SIL)
For SIL1 applications, the PFD
AVG
value needs to be < 10 -1 .
For SIL2 applications, the PFD
AVG
value needs to be < 10 -2 .
6 The switching contact output is connected to a standard NAMUR switching amplifier (e.g.
Pepperl+Fuchs KF**-SR2-Ex*.W). The failure rates of the amplifier are not included in the
listed failure rates.
MA_H250_M40_SIL2_R02_en_904202_PRT.book Page 13 Wednesday, June 26, 2013 9:04 AM