Hach DR 5000 - Manual (Page 48)

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Standard Operations
5.4.8 Run 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, deionized water is used to
determine the reagent blank value.
2. Select the test. If required by the (working) procedure, insert
the cell with deionized water into the cell compartment. Press
Zero.
3. Insert the prepared sample cell into the cell compartment.
Press Read. The result is displayed.
4. Press Options>More>Reagent Blank.
5. Press On to highlight the Reagent Blank function.
6. The concentration shown on the key is the measured value of
the reagent blank. To use this value for more analyses of this
parameter, press OK.
To enter a previously recorded reagent blank value, press the key
and use the alphanumeric keypad.
7. Press OK.
Note: The Reagent Blank function is deactivated when the measurement
program is left. To use the same blank value later for other tests using the
same reagent lot, enter the value per step .
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)
when the function is active.