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1, general dirt: 3% ~ 5% hydrochloric acid, high pressure water rinse (<689.476kPa);
2, oil or fat: isopropyl alcohol (abrasion-resistant ethanol), methanol, other solutions that can remove special grease;
3. PH electrode working under alkaline conditions: W=5%~10% hydrochloric acid solution, W=3%~7% sulfuric acid; concentrated hydrochloric acid and phosphoric acid mixed solution;
4. PH electrode working under acidic conditions: W=5%~10% hot alkaline solution (>56°C); W=5%~10% hydrochloric acid; W=2%~3% hydrofluoric acid;
5, sulfate and carbonate: W = 5% ~ 10% hydrochloric acid; concentrated hydrochloric acid and phosphoric acid mixed solution; sodium sulfite and sodium dithionite mixture;
6, silica or viscous: W = 2% ~% hydrofluoric acid;
Since the pH meter electrode is extremely fine, it is necessary to have sufficient patience to remove the dirt adhering to the pH meter electrode, and an appropriate safety device is used during the cleaning process. Choosing the right cleaning solution can make this job easier. When cleaning, immerse the electrode in the cleaning solution for at least 5 minutes so that the cleaning medium penetrates into the dirt. Two washes of the electrode are an effective method. First, the electrode is immersed in an acid or alkali solution. During the soaking process, the electrode of the electrode is brushed with a soft toothbrush to remove dirt. Then choose a solvent to clean. Finally, rinse the sensor and soak it in water or salt solution (KCl). Maintain its active sensitivity and extend electrode life.
Because the concentration of the medium measured by the pH meter electrode and the contaminated impurities are different, it needs to be cleaned for the next use. In order to maintain the measurement accuracy of the electrode and the activity of the electrode, different analysis is performed on the surface of the electrode film with different impurities attached below. . PH electrode cleaning impurities mainly have the following cleaning conditions