Hach DR 2800 Benutzerhandbuch

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 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.

Press Multi Wavelength in the Main Menu. Press Options for 
Parameter Setup.

For further Options

With the Store On setting, all measurement data are stored automatically. With the Store Off 
setting, no measurement data are stored.

To switch to % transmittance, concentration or absorbance readings

λ

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.

This functions as a stopwatch. It helps to ensure that the steps of an analysis are correctly timed 
(e.g. reaction times, wait times, etc., can be exactly specified). When the specified time has 
elapsed, an acoustic signal is emitted. The use of the timer has no influence on the measurement 
program.

Multiplication factor for converting absorbance values into concentration values.

To select the position of the decimal point in the calculated concentration readings.

Calculation basis for evaluating samples

To store the selected parameters as a User Program, see