Endress+Hauser Liquiline M CM42 - Page 70

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 70 of 72
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*1
According to Siemens SN29500 at 60°/100° Celsius – 140°F/212°F. MTBF
calculated as reciprocal of PFH/ 
Total
.
*2
During this time all diagnostic functions are completed at least once.
*3
Time between failure detection and failure reaction.
*4
Of course, you can choose different (e.g. longer) proof test intervals. Choose the
one suited for your application.
Note!
These values do NOT include the PFD
avg
/SFF values of the used voter and the sensor
element in contact with the medium. Nor does it take into account any medium
interactions with the sensor element.