Hach-Lange DR 2800 eco - Manual (Page 94)

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Advanced Operations
6.4 Multi-wavelength mode – measurements at more than one wavelength
(DR 2800 only)
If measurements are to be carried out at more than one
wavelength, two to four different wavelengths can be selected. The
number of wavelengths depends on the selected absorbance
formula.
In the multi-wavelength mode, absorbance values can be
measured at up to four wavelengths and the results can be
mathematically processed to obtain sums, differences and
relationships.
The following evaluation can be carried out with this measurement
program:
Absorbance measures the amount of light absorbed by the sample,
in units of Absorbance.
% Transmittance measures the percent of the original light that
passes through the sample and reaches the detector.
Turning on the concentration factor allows selection of a specific
multiplier for converting absorbance readings to concentration. In a
graph of concentration versus the absorbance, the concentration
factor is the slope of the line. Concentration is calculated using a
single factor for each wavelength, which is input by the user.
6.4.1 Setting the reading mode at different wavelengths
1. Press Multi Wavelength in the ”Main Menu“.
2. Press Options for Parameter Setup.
Table 13 ”Multi Wavelength“ options
Figure 15 Options
Options Description
More... For further Options
Store Off/On
With the Store On setting, all measurement data are stored automatically. With the Store Off
setting, no measurement data are stored.
% Trans/Abs To switch to % transmittance, concentration or absorbance readings
λ
Wavelength
To enter the measurement wavelength. Use the alphanumeric keypad to enter the measurement
wavelength. The entered wavelength must be in the range from 340–900 nm.