Hach-Lange DR 3900 User Manual - Manual (Page 76)

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Expanded programs
Chemical form:
1. Enter the chemical formula used in the display to represent
the analysis parameter.
2. Press Continue.
6.1.1.2 Multi wavelength settings
When selecting the Multi-Wavelength mode, the following
parameters can be defined:
Units:
1. Select the required unit from the list
2. Press Continue.
Note: User-specific units 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):
Define the wavelengths and the coefficients used in the formula.
The absorbance formula defines the calculation for the multi
wavelength reading.
1. Press Formula.
2. Select the formula relevant to the programming from the
displayed list.
3. Press OK to confirm the selection.
List of the available absorbance formulae
A
1
is the absorbance at wavelength 1,
A
2
is the absorbance at wavelength 2 and so on
K
1
is the factor at wavelength 1,
K
2
is the factor at wavelength 2 and so on
If a subtraction has to be performed, the factors can be entered
with a minus sign.