8
stay on the screen before pressing
(c) To exit calibration mode and go back to measurement mode, press key.
4.4 Sample Test
4.4.1. Rinse pH electrode in distilled or deionized 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 stays on LCD and a stable
reading is reached, which is the pH value of test solution.
!
!
!
!
!
!
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 after icon appears and stays
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 the calibration
mode.
in pH7.00 solution, press
1-point calibration is
done, the meter
enters measurement
mode
2-point calibration is
done, the meter
enters 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.
3-point calibration is
done, the meter
enters measurement
mode
"
Press key to
enter the calibration
mode.
Press key to
enter the calibration
mode.
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