There are several types of cleaning methods for the pH meter/PH meter. When measuring different media or working in different environments, the acidity meter/PH meter electrode is contaminated differently, so the cleaning method will be analyzed in detail. This article describes how to clean the milk after the pH meter has been tested, for general protein and high protein cleaning. Be sure to pay attention to the process, because the glass is usually measured by a pH meter/PH meter electrode. Cleaning the deposits left on the electrodes:
1) When measuring general dairy protein:
Soak for 15 minutes with pepsin in hydrochloric acid solution (HCl concentration 0.1 mol/L) or soak for 5 minutes with 10 sodium hypochlorite solution. After that, it should be washed with pure water and then immersed in a 3.3 mol/L KCL electrode soaking solution for 12 hours to maintain the equilibrium electrode potential. This will restore the original activity, if not, then see if you want to change the electrode;
2) When measuring high protein and high fat dairy products:
Soak the pH meter/PH meter electrode in dishwashing detergent for 1 hour. After the electrode was taken out, it was rinsed off, and it was immersed in the pepsin solution for 4 hours. Pepsin solution preparation method: 5% pepsin 0.5 MOL / L hydrochloric acid solution, 1:1 mixing. Finally, the electrode was taken out, washed with distilled water, and then immersed in a 3 mol/L (accurately 3.3 mol) KCL solution for use. The electrode should also be filled with 3 MOL/LKCL solution to avoid drying.
Because the acidity meter/PH meter is widely used in the dairy industry. Especially in the semi-finished products, the detection of the finished product plays a big role, such PH value reflects the quality of the measured object. If the accurate PH value cannot be measured in time for production reference, it will have an immeasurable impact on production.
Dairy products have the characteristics of high protein and high fat, which can easily cause blockage of the electrode glass bulb capillary. An electrode in normal use will have a slow reflection and unstable reading after about three months; in order to save the cost of use, allocate resources reasonably.