Acid/alkali concentration analyzer

The acid-base concentration meter indirectly measures the concentration of a solution by measuring its conductivity. It is known that at a constant temperature, the conductivity of a low concentration electrolyte corresponds to the concentration of the solution. When the concentration remains constant but the solution temperature changes, the conductivity also changes. That is, the concentration of the solution is a function of conductivity and temperature. If the temperature of the solution can be measured and corrected to the conductivity at standard temperature according to the corresponding relationship mentioned above, it can be directly converted to the concentration of the solution. To avoid electrode polarization, the instrument generates a highly stable sine wave signal added to the conductivity cell. The current flowing through the conductivity cell is proportional to the concentration of the measured solution. The instrument converts the current from a high impedance operational amplifier to a voltage, which is amplified, detected, and filtered by a programmable signal to obtain a potential signal reflecting the concentration; The microprocessor samples both temperature and conductivity signals simultaneously, and after calculation and temperature compensation, obtains the concentration value at a constant temperature.