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High temperature and low temperature when measuring with china ph meter digital
1. The high temperature of the water solution measured by the china ph meter digital at high temperature generally refers to above 60°C. Under this condition, the solution has a particularly serious erosion effect on the glass electrode of the china ph meter digital, especially in the alkaline pH range. This kind of erosion causes the drift of the potential of the glass electrode of the china ph meter digital, and the performance deteriorates. In microbial breeding tanks in the pharmaceutical, fermentation, food and other industries, the pH measurement requires that the glass electrode can withstand high temperature disinfection at 120-130 °C, that is, the china ph meter digital electrode is required to withstand the erosion of high temperature solutions. Another problem that needs to be solved in high temperature measurement is the stability of the reference electrode of the china ph meter digital.
In order to prevent AgCl from dissolving at high temperature, the AgCl layer is thickened, and solid AgCl is added to the electrode solution or AgCl single crystal is used as the reference electrode; the reference electrode can also be connected outside the high temperature area and connected through a salt bridge.
2. When the china ph meter digital at low temperature measures low temperature, the internal resistance of the china ph meter digital glass electrode rises sharply, so a low internal resistance china ph meter digital glass electrode should be used, and an organic solvent should be added to the solution in the china ph meter digital electrode. The freezing point can be lowered.