Use and Maintenance of Electronic Temperature Controller of PH Meter

A pH meter, commonly known as an acidity meter, consists of two main components: a metal electrode and an electronic meter. If the metal electrode can be effectively maintained in the application, and the pH indication deviation can be greatly reduced if the specified Yuyao digital thermostat Improve the credibility of the technical statistical data of chemical tests and medical tests. 1. Proper application and maintenance of metal electrodes: Currently, the metal electrodes used in laboratories are all composite metal electrodes. Their advantages include ease of use, resistance to reducing or oxidizing substances, and rapid equilibrium response. During application, the rubber sleeve and the plastic rubber sleeve at the lower web end of the metal electrode are all taken out to maintain the difference of the hydraulic press of the potassium chloride solution in the metal electrode. Below is a concise introduction to the application and maintenance of metal electrodes: 1. When not in use, composite metal electrodes should be fully immersed in a 3M potassium chloride solution. Do not soak in cleaning solutions or other reagents used for water absorption tests. 2. Before use, inspect the bulb at the tip of the glass electrode. Under normal circumstances, the metal electrode should be completely transparent and free of cracks; the bulb should be filled with aqueous solution, with no air bubbles present. 3. When precisely measuring highly concentrated aqueous solutions, minimize the measurement time as much as possible and thoroughly clean the instrument afterward to prevent the sample from adhering to the metal electrode and contaminating it.

4. after cleaning the metal electrode, the glass film cannot be scrubbed with filter paper, but the glass film can be sucked away with filter paper to prevent damage to the laminated glass plastic film, avoid cross-duty environmental pollution, and endanger the precision of accurate measurement.

5 in accurate measurement, pay attention to the silver-silver chloride internal reference electrode of the metal electrode, which should be infiltrated into the fluoride buffer solution in the bulb to prevent the large number from jumping in part of the information displayed by the electricity meter. When using, be sure to gently shake the metal electrode two times. 6. Metal electrodes must not be used in strong alkaline, strong acidic, or other corrosive aqueous solutions.

it is forbidden to use dry substances such as anhydrous ethanol and potassium dichromate? O: p>

2. specification buffer solution configuration and storage

1. pH standard substances should be stored in dry areas. for example, mixed polyphosphate pH standard substances will deliquesce when the relative humidity is very high. once deliquescence occurs, pH standard substances cannot be applied. 2. pH standard solutions should be prepared using twice-distilled water or deionized water. If a Class 0.1 pH meter is used for precise measurements, ordinary purified water may be employed. 3. When preparing pH standard solutions, use a small beaker for dilution to minimize the amount of standard solution that adheres to the inner walls of the beaker. The packaging bag or other utensils for storing pH standard substances shall be cleaned several times with purified water in addition to being cleaned and tidy, and then poured into the configured pH standard solution to ensure the accuracy of the configured pH standard solution. 4. Prepared standard buffer solutions can generally be stored for 2–3 months; if turbidity, mold growth, or precipitation is observed, the solution should not be used again. 5. Alkaline standard solutions must be stored in sealed PE bottles. Prevent carbon dioxide from entering the standard solution to form carbonic acid, thereby reducing its pH.