Endress+Hauser Liquiline M CM42 - Pending Messages and Logbooks

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 23 of 72
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DC
D
(Diagnostic coverage dangerous) 92 %
*1
According to Siemens SN29500 at 60°C/140°F. MTBF calculated as reciprocal
of PFH/ 
Total
, assuming constant failure rate.
*2
During this time all diagnostic functions are completed at least once.
*3
Time between failure detection and failure reaction (here this is the error current).
*4
Of course you can choose different (e.g. longer) proof test intervals. Choose the one
suited for your application by using the chart given below.
0,00E+00
2,00E-03
4,00E-03
6,00E-03
8,00E-03
1,00E-02
1,20E-02
012345678910
years
PFDavg
PFDavg
Proof test interval depending on PFD
avg
for the 1oo1D structure.
Years = "examples of proof test intervals"
Note!
These values do NOT include the PFD
avg
/SFF values of the used voter and for external
power supplies or external voltage supervisions.
Note!
For the calculation of the PFD
avg
a Markov model for a 1oo1D system was used.