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10. pH measurement
Before starting measurement, prepare the meter (chapter 6) and the pH
electrode (chapter 7) to work. Good condition of the electrode is the most
important condition for accurate measurements.
10.1. Measurement with automatic temperature compensation
During measurements with automatic temperature compensation the meter
cooperates with the temperature probe and measures the temperature of the
solution simultaneously with pH. The measured temperature is taken into
consideration during compensation.
In case of measurement with automatic temperature compensation:
- turn the meter on by pressing the button;
- choose the pH measurement mode by pressing the button;
- join the temperature probe and the combination pH electrode to the
appropriate connectors on the meter;
- if the electrode is not calibrated or has been already used for some time it
is advisable to calibrate it (chapter 8);
- insert the electrode and the temperature probe to the measured solution.
During measurements in vessels do not touch the bottom and the walls
with the electrode. It is to advisable to use an electrode stand;
- after stabilisation read the result (pic. 9).
Accurate laboratory measurements require using a stirrer.
Pic. 9
Note: exceeding of the range of temperature compensation is indicated by
blinking of the pH readout and the
symbol.
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