Hach-Lange DR 2800 eco - Manual (Page 59)

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Standard Operations
5.5.5 Sample blank
Turbidity and color in the sample matrix can falsify the results of a
photometric analysis. The interference factors come from the
sample or are created by reactions with the reagents.
The influence of turbidity and/or color can be eliminated or reduced
by taking a sample blank reading.
In the barcode mode, a special cuvette (LCW 919) containing the
sample blank is placed in the round cell compartment after the
sample reading has been taken, and is automatically measured.
The sample reading is then corrected by adding or subtracting the
blank value and the final result is displayed, together with the
message "After blank value corr.".
Some barcode tests do not require a sample blank value to be
determined, as turbidity and color are dealt with during the test
procedure.
5.5.6 Updating/Editing LANGE Barcode Cuvette Tests
5.5.6.1 Manual update
Using the data provided in the barcode, the instrument
automatically sets the measurement wavelength and factors. If a
discrepancy is detected between the barcode data and the stored
data, or a new test is identified, the instrument requests an update.
5.5.6.2 General advices regarding the programming respectively updating of program data
Table 7 Definitions of the program points
Program point Description
Name E.g. name of the analysis parameter
Version An abbreviation assigned by the user, or the version number, etc. is entered here
Measurement process
Exact definition of the test: the number of wavelengths at which measurements are carried out,
the number of absorbance measurements needed, the keys to be used, any waiting periods
between measurements, etc.
Formula Definition of the evaluation formulas with which the test result is calculated
Variables
The number of variables shown in the display depends on the definition of the measurement
process and the formulas. Input of the numerical values of the wavelengths, factors, constants,
etc.