Hach Portable Spectrophotometer DR 2800 - Manual (Page 64)

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Advanced Operations
Chemical form:
Enter the chemical formula used in the display to represent the
analysis parameter.
Use the alphanumeric keypad to enter the chemical form and press
Next to enter Calibration settings.
6.1.1.2 Multi wavelength settings
If the Multi Wavelength mode is selected, the following parameters
can be defined:
Units:
Select the required unit from the list and press Next.
Note: Units of measure not included in this list can be added in the edit
program under Program Options, Edit. Select Units, Edit and then New.
Absorbance formula (multi-wavelength program type):
The Absorbance Formula menu is used to define the wavelengths
and the coefficients used in the formula. The absorbance formula
defines the calculation for the multi-wavelength measurement.
Press the appropriate key to edit the input.
Press the Formula key.
In the displayed list, select the formula for the program and press
OK to confirm.