Chapter 2 Taking Measurements
2.5 Conductivity measurement
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Calibrating the cell constant
The cell constant of the electrode changes as the electrode is used. Cal-
ibrate the cell constant once a year or so.
Calibrating the cell constant will update it to match the condition of the
current electrode.
The cell constant is calibrated with a standard solution of potassium chloride.
To prepare a standard solution of potassium chloride, refer to “
potassium chloride standard solution” page 71.
1.
Immerse the electrode in the standard solution of potassium
chloride.
2.
Enter the Calibration mode by pressing the MODE key in the
CELL SET mode.
3.
Enter the value of the standard solution used for calibration in the
Calibration mode using the
▲
and
▼
key.
Conductivity and temperature coefficient for various solutions” page
When the temperature conversion has been set to ON when setting the
temperature coefficient, calibration is performed with the converted
temperature.
4.
Start the calibration by pressing the CELL key.
HOLD is displayed and the calibration is completed.
To redo the calibration, press the CELL key once more.
5.
Press the MEAS key to enter the Measurement mode.
If any calibration error occurs, take it as a indication that the electrode has gone
bad. Replace the old electrode with a new one.
