Hach DR 2800, User Manual, Page: 36 / 96

36
Standard Operations
5.4.5 Running a Standard Adjust
The Standard Adjust functions allows the calibration curve for a
stored program to be adjusted based on analysis of a known
standard solution. The Accuracy Check section of written
procedures often suggests a standard solution concentration for
this purpose.
Read a standard before setting Standard Adjust to On.
1. Follow the entire procedure, using a known standard for
the sample.
2. After reading the concentration, press
OPTIONS
>
MORE
>
STANDARD ADJUST
.
3. If Standard Adjust is set to Off, turn it On.
The Current Reading will show the concentration. The box on
the right will show the suggested default standard value for the
test, as mentioned in the procedure.
4. If the measurement used a standard concentration that is
different from the one displayed in the box, press the box on the
right to enter a different standard value and enter the new
value. Press
OK
to confirm.
5. Press
ADJUST
to enable the Standard Adjust. The
STANDARD
ADJUST
icon will appear.
Note: The adjustment must be within certain limits, which vary with
each program. The allowable percentage is shown after “Adjustment“.
Note: When a Standard Adjust is in effect, the
STANDARD ADJUST
icon will appear on the display.
5.4.6 Setting the Chemical Form
Some Stored Programs allow a variety of chemical forms to
be selected.
Press the unit (e.g. mg/L) or the chemical representation of the
evaluation form (e.g. Al
3+
). A list of available chemical forms is
displayed. Select the required form by pressing the corresponding
entry in the list.
Note: When the program is exited, the evaluation form reverts to the
standard setting.
Note: The stoichiometric conversion of the measurement result is carried
out automatically.
Note: The selected Chemical Form will appear on the display. Test results
will be calculated and displayed in this chemical form
Alternatively, the standard setting can be changed by pressing
OPTIONS
>
MORE
>
CHEMICAL FORM
. Select the required form and
press
OK
.