How to Care for pH Meter Electrodes

1. Proper Storage

• Always store the electrode in a pH storage solution (KCl solution), never in distilled or deionized water — this can damage the glass membrane.

• Keep the protective cap filled with storage solution when not in use.

2. Cleaning the Electrode

• Routine cleaning: Rinse with distilled water after each use to remove residues.

• Protein deposits: Clean with a mild enzyme solution.

• Grease/oil deposits: Use a mild detergent or alcohol solution.

• Avoid abrasive cleaning — it can scratch the glass bulb.

3. Calibration

• Calibrate regularly using fresh buffer solutions (pH 4, 7, and 10) before measurements.

• Do not reuse or pour back used buffer solutions into the stock bottle.

4. Handling Tips

• Avoid touching the glass bulb with fingers — oils can interfere with readings.

• Prevent the electrode from drying out — it will cause slow response or permanent damage.

• Handle gently; the glass membrane is fragile.

5. Periodic Maintenance

• Replace storage solution regularly to prevent contamination.

• Check for air bubbles in the internal electrolyte — remove by gently shaking the electrode.

• Replace the electrode if readings become unstable despite cleaning and calibration.

✅ Key Takeaway:
pH electrodes are sensitive instruments — proper storage, cleaning, calibration, and handling will extend their life and ensure accurate readings.