Endress+Hauser Liquiline M CM42 - Pfd; Computation Example for a Ph Measuring Point

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 66 of 72
Alle Recht
e vorbehalten. Das Kopieren dieses Dokuments und die Verwendung von Teilen aus diesem Dokument ist
ohne schriftliche Genehmigung der Endress+Hauser Conducta GmbH+Co. KG nicht erlaubt.
All rights reserved. Passing on and copying of this document, use and communication of its contents not
permitted without written authorization from Endress+Hauser Conducta GmbH+Co. KG.
Proof Test Example - Memosens Cable CYK10
0,00E+00
1,00E-04
2,00E-04
3,00E-04
012345
t [years]
PFDavg(t)
PFDavg(t) Target/Allowed PFD PFDavg(t)
The dotted line is the PFD
avg
(t) value, if the proof test is done after 2 years and 21.6
months. The solid line, if the proof test is done after 2 years and 4 years. And the
straight horizontal line denotes the limit of the PFD
avg
value given by the customer.
11.2 PFD
avg
computation example for a pH measuring point
Note!
The following example can be used as the result for the safety parameters of the
complete Endress+Hauser pH SIL measuring chain (see table at end of chapter).
Assume we have a measuring point consisting of the following components from
Endress+Hauser:
1. Memosens pH glass sensor Orbisint CPS11D, SIL
2. Memosens cable CYK10, SIL
3. Memosens transmitter Liquiline M CM42, SIL