Chapter 2 Taking Measurements
2.5 Measuring pH
20
HORIBA
To stop the calibration:
Press the CAL key while the HOLD mark is blinking.
To establish the calibration:
Press the ENTER key while the HOLD mark is blinking.
To redo the calibration:
Press the CAL key after the HOLD mark is displayed.
Calibration at second point
1.
Wash the electrode well again with pure (de-ionized) water, and
then wipe with filter paper or tissue paper.
2.
Immerse the tip of the electrode in a beaker containing pH 4
standard solution.
3.
Press the CAL key to start calibration.
The measured value will be displayed, and HOLD will blink until
the reading stabilizes.
When the value stabilizes,
HOLD will stop blinking and the
calibrated value will be displayed.
The
bottle mark will be displayed, indicating that calibration
was conducted with pH 4 standard solution.
4.
Press the MEAS key to return to the pH Measurement screen.
While calibrations are being in the Calibration mode, redoing a calibration only
updates the calibration data for the pertinent standard solution. If a calibration
is redone after the pH meter is returned to the Measurement mode, however,
the calibration is conducted on the initial status of the meter; i.e., all the
previous calibration data is cleared.
The example of calibration at second point has explained the calibration
process using the order from pH 7 to pH 4. However, the calibration order of the
standard solutions can be arbitrarily chosen.
