Hach-Lange DR 2800 eco - Manual (Page 80)

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Advanced Operations
6.1.3.3 Calibration formula (evaluation formula)
The calibration formula (evaluation formula) defines the calculation
and display of intermediate and final results. The previously defined
elements of the measuring sequence are the basis for calculating
the concentrations.
Entering calibration formula C1
1. Activate the Formula line in the data overview and press Edit.
2. Activate the line C1: Off and press Edit.
3. Select C1: Off again and press Edit. The display changes to
C1: On.
4. Activate the next line C1 = to define the formula and press Edit.
Note: The evaluation formula is built up successively in the display in
accordance with your input.
Note: The arrow key deletes the most recently entered element of the
formula.