Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0
28 of 72
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Entering SIL mode:
After password confirmation the software leads you to check and confirm the values of
the lower and upper current output value in [pH] and the pH alteration rate in [pH/s].
These values are shown three times on random positions to eliminate the influence of
possible display errors.
Push the “Yes” soft key for confirmation and the "No" soft key, if there is something
wrong with the values. The "Yes" soft key is always randomly placed.
Now the SIL mode is active, and in the status bar the SIL icon is shown:
Now both current outputs show a high error current until you switch into the
SIL measurement mode!
Leaving SIL mode:
After selecting this from the Setup - Functional Safety menu just enter the password and
you will leave the SIL mode (the SIL icon is gone). Note that the error current is set
on the current outputs for at least 4 seconds. After that time, the Classic mode is
responsible for both current outputs and the outputs are no longer safe!
The SIL mode requires for certain settings which have to be set in case the operator
changed the default settings. If any for the SIL measurement mode relevant condition is
not fulfilled, a pop-up window will indicate this.
Settings needed to switch to SIL mode:
pH offset 0
MEAS temperature compensation mode ATC
CAL temperature compensation mode ATC
CAL buffer recognition fixed
Buffer manufacturer E+H
Sensor diagnostics on
2 point calibration on
Error 011 F
Error 012 F
Error 377 F
Current output 1 Main value
Current output 2 Main value
Error current 21.5 mA
Simu current output 1 off
Simu current output 2 off
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