Chapter 2 Taking Measurements
2.5 Measuring pH
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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 centime-
ters.
2.
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 pH7 standard solution
Open
Close
3 cm or
more
