Hach-Lange DR 3900 User Manual - Manual (Page 99)

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Expanded programs
6.4.2 Take single wavelength readings (single reading)
1. Insert the zero solution cell into the cell compartment.
2. Press Zero.
Note: The Read key is only active after the zero reading has been
completed.
3. Insert the analysis cell into the cell compartment.
4. Press Read.
5. For data storage, refer to section 5.3.1, page 43 .
6.5 Multi Wavelength mode – readings with more than one wavelength
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.
• Absorbance readings: The light absorbed by the sample is
measured in absorbance units.
• % 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.
6.5.1 Set the Reading mode at different wavelengths
Press Multi Wavelength in the Main Menu. Press Options for
Parameter Setup.