OPERATION MANUAL
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electrode, otherwise the electrode will not work if the top glass ball of electrode is
broken.
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When using liquid chargeable electrode, please note that if liquid inside decreases to
be less than half volume, please use burette to add liquid from hole at the top. When
measuring, please turn the blue circle to cover the small hole.
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When electrode moves from one solution to another solution, it should be cleaned by
distilled water and dried by filter paper. Do not wipe the glass ball to avoid sluggish
response. The best method is washing electrode by the next test solution.
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Avoiding that the bubble cut off the reference solution inside the electrode, if it exists,
please eliminate it by shaking off the electrode.
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Please reduce the immerse time when testing the strong acid and alkali or special
solution (like: protein, paint and so on), after testing, wash it carefully.
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The slope and response time of electrode will be decrease a little after long time
using, please immerse the electrode ball for 24hours into 0.1 mol/L HCL solution
(preparation: 9ml HCL diluted to 100ml by Non-Ion water).
Common Problem Checking
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Most problems are due to electrode functional problem or wrong measurement, not
the instrument. Besides, buffer solution and other factors will lead to some problems,
please check carefully, and find out what exactly the problems are.
Electrode
If the instrument is operating well, but the reading is unstable, instrument responds slowly,
or cannot be calibrated to the right pH value, please check electrode first as below:
1. Whether electrode sensor inserts into testing liquid or not
2. There are no bubbles inside electrode
3. Electrode ball is not polluted
4. Electrode and instrument are well connected, and lead wire is not loose or broken.
Standard buffer solution
If the instrument and the electrode is operating well, the readout is not correct or cannot
be calibrated, please check the standard buffer solution:
1. Use the exact standard pH buffer solution.
2. The buffer solution is under quality guarantee period and not be polluted.
