measuring mode.
IV. pH Measurement
1. Preparations
1.1. Press to switch on device, then press to choose pH measuring
mode.
1.2. Check if the glass bulb of pH combined electrode is moist and complete. If the
bulb is broken, then the electrode will not work, if the bulb is too dry, it should be
soaked in saturated KCL solution for 24 hours.
1.3. Connect pH electrode and temperature probe to its right ports.
2. Calibration
2.1. Press to enter calibration mode, the screen will show C1 to indicate first
point calibration.
2.2. Wash pH and temperature electrodes in pure water and make them dry, dip the
electrode in the pH 6.86 buffer solution, shake the electrode and let it be static until
the reading is stable (the symbol will be shown on the screen), then press
and display shows 6.86, next press to confirm the first point calibration, the
screen will show C2 to indicate second point calibration or press to quit
calibration mode.
2.3. Wash pH and temperature electrodes in pure water and wave them dry, dip the
electrode in the pH 4.00 buffer solution, shake the electrode and let it be static until
the reading is stable (the symbol will be shown on the screen), then press
and display shows 4.00, next press to confirm the second point calibration, the
screen will show C3 to indicate the third point calibration or press to quit
calibration mode.
2.4. Wash pH and temperature electrodes in pure water and make them dry, dip the
electrode in the pH 9.18 buffer solution, shake the electrode and let it be static until
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