The correct use and maintenance of the PH pH meter are related to the service life of the instrument and accurate measurement data.

The current advantages of the composite electrode used in the laboratory are its ease of use, freedom from oxidizing or reducing substances, and its high equilibrium speed. In use, the rubber sleeve and the rubber sleeve at the bottom of the electrode filling port are completely removed to maintain the hydraulic pressure difference of the potassium chloride solution in the electrode. Here's a simple introduction to the use and maintenance of the electrode:

1. When the composite electrode is not used, it can be fully immersed in 3M potassium chloride solution. Never wash with wash solution or other absorbent agents.

2. Before use, check the bulb at the front of the glass electrode. Under normal conditions, the electrode should be transparent and free from cracks; the bulb should be filled with a solution and no bubbles should be present.

3. When measuring a solution with a large concentration, try to shorten the measurement time as much as possible and carefully clean it after use to prevent the measured liquid from adhering to the electrode and contaminating the electrode.

4. After cleaning the electrode, do not wipe the glass film with filter paper, but use filter paper to dry it to avoid damage to the glass film and prevent cross-contamination, affecting the measurement accuracy.