NAVI D-25 Instruction Manual page 39

2 Taking Measurements
2.5 Measuring pH
28
2.
Wash the tip of the electrode well with pure (de-
ionized) water, and then wipe with filter paper or
tissue paper.
3.
Open the internal solution filler port.
Leave the port open while calibration is taking
place.
Calibration at first point
1.
Immerse the tip of the electrode in a beaker
containing pH 7 standard solution.
Immerse the pH electrode in the sample at least
three centimeters.
Open
Close
3 cm or
more
HORIBA