User Manual

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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.
Press to
turn on the
meter.
Press key to
enter the
calibration mode.
Sample
Test
1
st
point
calibration
2
n d
point
calibration
3
r d
point
calibration
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
automatically.
Submerge the
electrode in
pH10.01 solution,
press key when
icon appears.
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
Display
Icons
Contents
How to fix
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%）
4.4.3 pH isothermal measurement principle
According to the pH isothermal measurement principle, the closer the test sample’s temperature is to the calibration
solution’s, the higher the accuracy of the measurement. So this principle is recommended to follow when conducting
tests.
4.4.4 Restore to factory default
The instrument has a function to return to factory default setting, which can be set up in P1.2 (refer to section 7.3).