Endress+Hauser Liquiline M CM42 - Page 69

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 69 of 72
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Parameters according to
IEC 61508
E+H Memosens pH SIL
measuring chain
Safety Function
1: pH limit monitoring
2: pH value measurement
3+4: safe calibration and adjustment
SIL
Hardware: 2, Software: 2
in homogenous redundancy: 2
HFT 0
Device Type B
Mode of Operation Low demand mode
SFF 93.8 %
MTTR (used for PFD calculation) 8 h
T
1
(Proof test interval)
Recommended: 1 / 1 / 1 year,
(sensor / cable / transmitter)

SD
688 FIT

SU
1623 FIT

DD
4473 FIT

DU
447 FIT

Total
*1
7238 FIT
PFD
avg
(for T
1
= 1 / 1 / 1 year)
*4
19.6 × 10
-4
PFH
4.5 × 10
-7
MTBF
*1
15 years
Diagnostic-Test-Interval
*2
< 60 min
Error Reaction Time
*3
< 10 seconds
DC
D
(Diagnostic Coverage Dangerous) 91 %