Calibration is performed by selecting the CONC mode and then moving the cursor to the CAL menu option
and pressing . The instrument will then show:
An icon will appear the CAL 1 buffer value and the first part of the calibration. The display will also indicate
CAL 1 to the right hand side of the main reading. The buffer values can be changed at this point by entering
the CAL BUFFERS... menu and setting new values by using the numeric keys and pressing .
To calibrate the instrument select the CALIBRATE menu option using the arrow keys. The electrode(s)
should be placed in the most dilute standard and the reading allowed to stabilise. (the endpoint symbol will be
displayed) prior to pressing the key. The display will then update to the standard buffer value, corrected
for temperature (actual temperature will be displayed).
The icon will then change to show the CAL 2 buffer value . If a one point calibration only is required select
the EXI T option using the arrow keys and pressing . The instrument will return to the CONC mode.
If a 2, 3, 4 or 5 point calibration is required the electrode(s) should be placed in the appropriate standards in
turn, rinsing between each measurement. Once the required number of calibration points are completed
select the EXIT option. The instrument will return to the CONC mode.
Once calibration is completed the instrument is now ready to perform sample measurement.
Rinse electrode(s) and place in the sample. Allow the reading to stabilise (the endpoint symbol will be
displayed).
Repeat for each sample.
At the end of sample measurement re-check the calibration of the instrument using one standard solution.
NOTE: Accuracy will be dependent upon the number of calibration points performed.
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