Hach DR 2800, User Manual, Page: 37 / 96

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Standard Operations
5.4.7 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 as specified 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
zero solution in the cell compartment. Press
ZERO
.
3. Place the prepared cell in the cell compartment and press
READ
. The result is displayed.
4. Press
OPTIONS
>
MORE
>
REAGENT BLANK
.
5. Press On to activate 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
.
7. If the measurement does need to be saved, press the key and
use the alphanumeric keypad to enter a previously recorded
reagent blank value.
8. Press
OK
.
Note: The Reagent Blank function is deactivated when you leave the
measurement program. To use the same blank value later for other tests
using the same reagent lot, enter the value per step
7 .
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.