Xylem ProLab 4000 - Manual (Page 119)

ProLab 4000 Ion concentration
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5 Thoroughly rinse the electrode with deionized water.
6 Immerse the electrode in the sample.
7 Start the measurement with [Continue].
After end of the measurement, the Standard pops up.
8 In the Standard register, enter the value for Standard concen-
tration if necessary.
9 Use [Dosing] to automatically add to the sample the adjusted
volume of the standard solution (Standard volume) (1 vol% of
sample solution).
or
If the burette control is inactive:
Add to the sample the adjusted volume of the standard solution
manually (Standard volume) (1 vol% of sample solution).