Submerge the
electrode in pH4.00
solution, press
key when
appears.
Submerge the
electrode in pH7.00
solution, press
key when icon
appears.
After the 1
st
point
calibration is done,
press key to
enter the
measurement mode.
After the 2
nd
point
calibration is done,
press key to
enter the
measurement mode.
After the 3
rd
point
calibration is done,
the meter enters the
measurement mode
Submerge the
electrode in
pH10.01 solution,
press key when
icon appears.
4.4 Sample Measurement
4.4.1 Rinse the pH electrode in distilled water, dry it, and dip it into sample solution. Stir the solution gently
and let it stand still in the sample solution until icon appears and stays on LCD, get the pH reading,
which is pH value of sample solution, please refer to Figure-5 for calibration and measurement process of
the pH meter.
Figure-5 Calibration and measurement process of pH meter
4.4.2 Self-Diagnosis Information
Table – 4 Self-diagnosis information
Wrong pH buffer solution or the
buffer solution out of range.
1.Check whether pH buffer solution is correct.
2.Check whether the meter connects the electrode
properly.
3.Check whether the electrode is damaged.
Press when measuring value
is not stable during calibration.
Press key when icon appears and stays.
During calibration, the
measuring value being unstable
for over 3 minutes
1.Check whether there are air bubbles in the glass
bulb. To remove the air bubble, hold the electrode
firmly and flick the electrode in a downward motion
for several times.
2.Replace with a new pH electrode.
pH electrode zero electric
potential out of range
<-60mV or >60mV)
1.Check whether there are air bubbles in the glass
bulb. To remove the air bubble, hold the electrode
firmly and flick the electrode in a downward motion
for several times.
2.Check whether pH buffer solution is correct.
3.Replace with new pH electrode.
pH electrode slope out of range
(<85% or >110%)