Endress+Hauser Liquiline M CM42 - Adapting Diagnostic Information

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 22 of 72
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Functional safety parameters
Specific functional safety parameters for single-channel device operation:
Parameters according to
IEC 61508
Liquiline M CM42, Memosens
Safety function
1: pH limit monitoring
2: pH value measurement
3 and 4: safe calibration / adjustment
See also chapter Fehler! Verweisquel-
le konnte nicht gefunden werden.
for details.
SIL
Hardware: 2, Software: 2
in homogenous redundancy: 2
HFT 0
Device type B
Mode of operation Low demand mode
SFF 94.8 %
MTTR (used for PFD calculation) 8 h
T
1
(Proof test interval) Recommended 1 year (see chart below)

SD
688 FIT

SU
947 FIT

DD
2667 FIT

DU
236 FIT

Total
*1
4549 FIT
PFD
avg
(for T
1
= 1 year)
*4
1.03 × 10
-3
PFH
2.36 × 10
-7
MTBF / MTBF
DU
*1
25 years / 483 years
Diagnostic test interval
*2
< 60 min (without RAM-test: <10 min)
Error reaction time
*3
< 1 second