Hach DR 2800, User Manual, Page: 62 / 96

62
Advanced Operations
6.4 Multi-Wavelength Mode
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.
6.4.1 Setting the Reading Mode at Different Wavelengths
1. From the Main Menu, press
MULTI WAVELENGTH
.
2. Press
OPTIONS
for Parameter Setup.
Table 10 Multi-Wavelength Setup Options
Option Description
Store Off/On
With
STORE ON
selected, all measurement data are stored automatically. With
STORE OFF
selected, no measurement data are stored.
% Trans/Abs/Conc
Toggles between % transmittance, absorbance, or concentration readings .
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.
Concentration: Allows the selection of a specific multiplier for converting absorbance readings to
concentration.
λ
(Wavelength)
Enter the measurement wavelengths. Use the alphanumeric keypad to enter the measurement
wavelengths. The entered wavelengths must be in the range from 340–900 nm.
Timer icon
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
audible signal is emitted. The use of the timer has no influence on the measurement program.
Concentration Factor Multiplication factor for converting absorbance values into concentration values.
Concentration Resolution Select the position of the decimal point in the calculated concentration readings.
Absorbance Formula Calculation basis for evaluating samples.
Save as User Program Stores the selected parameters as a user program ( section 6.1 on page 47 ).
Recall Data Recalls saved measurement data, wavelength scans or time courses ( section 5.3 on page 28 ).
Instrument Setup Basic operation settings of the instrument ( section 5.2 on page 23 ).