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3.2 pH Calibration
It is necessary to perform calibration before pH measurement.
We recommend performing calibration once a day, before measurement.
Set the conditions of resolution and temperature compensation before pH calibration
according to "3.5 pH Measurement Setting" (P.44).
HINT!
How to select standard solutions used for calibration
・Perform 2 points calibration using pH7 and pH4 when you know that the sample is
acidic; pH7 and pH9 when you know that the sample is alkaline.
・Perform 3 points calibration using pH4, pH7, and pH9 when the sample is unknown.
・For calibration other than that by 2 points, change the calibration point setting.
on the pH CAL screen allows you to check the current calibration data.
・Tapping
To clear the calibration data, tap
As an example, the procedures of 2 points calibration using pH4 and pH7 standard
solutions are as follows.
3.2.1 Calibration Preparation
.
1.
Tap the channel setting and the measurement
item in the MEAS screen to set "CH1" and "pH".
2.
Tap the CAL key to display the pH CAL screen.
3.
Wash the pH electrode with pure water (ion
exchange water), and wipe it off by filter paper or
tissue paper.
4.
Open the internal solution filler port of the pH
electrode.
5.
Immerse the pH electrode into a beaker of pH7
standard solution.
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