Hach-Lange DR 2800 eco - Manual (Page 51)

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Standard Operations
5.4.6 Running a Reagent Blank
Some of the stored tests/methods include the "Reagent Blank"
function. This enables the reagent blank value to be measured and
then taken into account in calculating the measurement result.
Measurement/analysis of a reagent blank:
1. Prepare the test/method in accordance with the (working)
procedure. Instead of a sample, distilled water is used to
determine the reagent blank value.
2. Select the test. If required by the (working) procedure, place the
reagent blank in the cell compartment. Press Zero.
3. Place the prepared sample cuvette in the cell compartment.
Press Read. The result is displayed.
4. Press Options, More... and Reagent Blank.
5. Press On to activate the Reagent Blank function.
6. The concentration shown on the key is the measured value. If
you want to use this value for more analyzes of this parameter,
press OK.
7. If you do not want to save the measured value, press the key
and use the alphanumeric keypad to enter a theoretical reagent
blank value.
8. Press OK.
Note: The Reagent Blank function is deactivated when you leave the
measurement program.
Note: The results calculated using the reagent blank value must lie within
the limits of the measuring range of the test/method.
Note: The reagent blank icon is shown in the result display (see arrow).