Endress+Hauser Liquiline M CM42 - 5 Maintenance, Recalibration; 6 Proof Test; Testing to Ensure Its Safe Functioning; Proof Test of the Liquiline M CM42 Transmitter

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 49 of 72
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The last picture above shows the result of the temperature calibration: the active safe
state has been entered and the reason is 00000003, which means a safe calibration has
taken place.
5 Maintenance, recalibration
If necessary (depending on the application), it is recommended to clean the device
occasionally.
6 Proof test
6.1 Proof test
Safety functions must be tested at appropriate intervals to ensure that they are working
correctly.
The time intervals must be defined by the operator (refer to chapter 2.3).
Proof testing must be carried out in accordance with the procedure given below.
If several devices are used in MooN ("M out of N") configurations, the proof test
described here must be performed separately for each device.
In addition, checks must be carried out to ensure that all restrictions for the operation
are still obeyed (see chapter 2.3).
6.2 Testing to ensure its safe functioning
Note!
Please see also the section "Maintenance, recalibration" in chapter 5.
Note!
If one of the described proof criteria is not satisfied, you are not allowed to use the
device as a part of a safety related system anymore.
Note!
The proof test is used to detect random failures. The influence of systematic errors on
the safety function is not covered by this test and has to be considered separately.
Systematic errors can for example be forced by medium properties, environmental
conditions, corrosion, etc.
6.2.1 Proof test of the Liquiline M CM42 transmitter
You need a transmitter, a Memosens cable and a Memosens sensor. All components
must be certified according to IEC 61508. You need an already calibrated sensor. You