Hach-Lange DR 2800 eco - Manual (Page 70)

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Advanced Operations
Absorbance Formula (Multi-wavelength program type):
The Absorbance Formula menu is used to define the wavelengths
and the coefficients used in the formula. Press the appropriate key
to edit the input.
Absorbance Formula:
The absorbance formula defines the calculation for the
multi-wavelength measurement.
Press the formula key.
In the displayed list, select the formula for your program and
confirm your selection by pressing OK.
List of available Absorbance Formulas
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 carried out, the factors can be entered
with a minus sign.
Wavelength
λ
x
:
Press a
λ
x
key and use the alphanumeric keypad to enter a
wavelength. Press another
λ
x
key and enter the next wavelength. If
necessary, repeat until all the wavelengths for the formula have
been entered. The wavelengths must be in the range from
340–900 nm.
Press OK.
Concentration Factor Kx
Multiplication factor for converting absorbance values into
concentration values.
Press a factor key and use the alphanumeric keypad to enter a
factor. If the formula includes more than one factor, press another
factor key and enter another factor, and repeat until all the factors
have been entered.
Note: Up to five digits can be entered, including a maximum of 4 decimal
places.
Press OK.
When all the relevant data have been entered, press Next.