Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version:
Page:
2.0
39
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Tk = (T1+T2)/2, mean temperature of calibration
S'
25°C
and pH
NP
will be stored in the sensor, if the safe adjustment is used.
For the formulas of the pH calculation see chapter 2.1.
To start the calibration/adjustment use the menu "2 point calibration" from the CAL
menu. Then follow the instructions given on the display. The sequence is the same as
for the traditional unsafe calibration/adjustment in classic mode. Except that there are
some safe screens in between.
During the 2 point calibration in SIL mode the current outputs show the measured
values of the calibration. Only after the calibration is finished or cancelled the error
current is set on both current outputs, because you have entered the active safe state.
Important!
Use only the "safe screens" to document or check values. Safe screens are characterized
by small, very basic font, the black status bar is not shown. Example: screen “SIL
measurement mode reached”. All other screens are not safe and are just for controlling
the sequence of the calibration/adjustment.
If any of the given screenshots here are not displayed or the sequence is not the same as
given here, you have to stop the calibration/adjustment and start over again. If the
"error" persists", you have to change the transmitter or call E+H service.
See the following screenshots for the sequence of screens:
