Method for measuring liquid conductivity

Abstract

The invention discloses a method for measuring liquid conductivity. The method comprises the following steps of: S1, placing two metal electrodes in liquid, respectively connecting a first pin and a second pin of a single chip microcomputer, then enabling the electrical parameter characteristics of the liquid to be equivalent to a capacitor and a resistor which are connected in parallel, and simultaneously connecting a resistor in parallel, connecting a resistor in series between the first pin and the metal electrode to form a measuring circuit; S2, repeatedly transmitting a group of level signals by the first pin of the single chip microcomputer, and repeatedly transmitting a group of pulse signals by the second pin of the single chip microcomputer, thus enabling the charging and discharging time of the two metal electrodes to be consistent, and avoiding a polarization effect; and S3, in the process of transmitting the level signal by the first pin, performing sampling for multiple times by utilizing a sampling pin of the single chip microcomputer, and calculating the conductivity according to a sampling value. The liquid polarization problem can be effectively avoided, and the method has the characteristics of simple circuit, high measurement precision and the like.

Description

Technical field[0001]The invention relates to the technical field of measuring the conductivity of liquids, in particular to a method for measuring the conductivity of liquids.Background technique[0002]With the rapid development of industrial and agricultural production, as well as with the production and life of human beings, the conductivity measurement of solutions has become a very important topic. For example, in the field of new energy vehicles, the measurement of the conductivity of the solution in the lithium battery of the electric vehicle is a key technology, which affects the energy efficiency of the electric vehicle, as well as the range, peak power and so on. In the field of water treatment, a lot of useful information can be obtained by measuring the conductivity of water. Water quality testing plays a vital role in water pollution control and the entire water environment protection. For example, if the content of fluoride in drinking water is too much, it will cause m...

AI Technical Summary

Problems solved by technology

That is, it can be seen from the above formula that the measured voltage value and conductivity are inversely proportional functions. If the final measured physical quantity and conductivity are directly proportional or inversely proportional, then the measured value is likely to be high or low. the resolution is not enough

That is: the rate of change of the measured value becomes smaller and smaller with the change of the physical quantity, so the measurement accuracy is not accurate enough

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