Metrohm Vision Manual - Manual (Page 147)

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Click on Mode/Quantitative
Analysis/Sample Selection.
Drag and drop the product with
calibration spectra to the Equation field.
Select the constituent as shown:
and the equation name:
Note: It is not important at this point to select any particular constituent
Click on Select/Create Equation for Pre-
processing. (if the menu item is not active, make
sure the newly created equation is selected and
highlighted).Vision displays a window. Type in the
pre-processing constituent name, in our case
concentration.
Click on OK and confirm the creation of the new
constituent. This will automatically save the
equation. You will also notice that the equation
name has been changed. A prefix Pre_ has been
added, so now the equation name is
Pre_PREPROCESS.
3. The next step is to define the pre-processing formula.