4.4 Sample Test
4.4.1. Rinse pH electrode in pure water, allow it to dry, and submerge it in tested solution. Stir the solution
briefly and allow it to stay in the tested solution until icon appears on LCD and a stable reading is
reached, which is the pH value of tested solution.
Diagram – 7 is the calibration and measurement process of pH meter
Diagram – 7 Calibration and measurement process of pH meter
4.4.2. Self-diagnosis information
During the process of calibration and measurement, the meter has self-diagnosis functions, indicating the
relative information as below, please refer to chart – 5.
Chart – 5 Self-diagnosis information of pH measurement mode
Wrong pH buffer solution or the
recognition of calibration solution out of
range.
1. Check whether pH buffer solution is correct.
2. Check whether the meter connects the
electrode well.
3. Check whether the electrode is damaged.
Press key when measuring value is
not stable during calibration.
Press key after icon appears.
During calibration, the measuring value
is not stable for ≥3min.
1. Check whether there are bubbles in glass bulb.
2. Replace with new pH electrode.
pH electrode performance error
zero potential <-60mV or >60mV,
slope <75%
1. Check whether there are bubbles in glass bulb.
2. Check whether pH buffer solution is correct.
3. Replace with new pH electrode.
Press to turn
on the meter
Press key to
enter into the
Submerge the electrode
in pH7.00 solution, press
key when
icon
is done, the meter
enter in measurement
mode
is done, the meter
enter in measurement
mode
Submerge the electrode
in pH4.00 solution, press
key when
icon appears.
Submerge the electrode
in pH10.01solution,press
key when
icon appears.
calibration is done,
the meter enter in
Press key to
enter into the
Press key to
enter into the
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