A method for measuring the conductivity of liquids

Abstract

The invention discloses a method for measuring the conductivity of a liquid, comprising the following steps: S1: placing two metal electrodes in the liquid, connecting the first pin and the second pin of a single-chip microcomputer respectively, and then measuring the electrical parameters of the liquid The characteristic is equivalent to a capacitor and a resistor connected in parallel, and a resistor is connected in parallel at the same time, and then a resistor is connected in series between the first pin and the metal electrode to form a measurement circuit; S2: The first pin of the microcontroller repeatedly transmits a set of level signals, The second pin of the single-chip microcomputer repeatedly transmits a group of pulse signals to make the charging and discharging time of the two metal electrodes consistent and avoid polarization effects; S3: use the sampling tube of the single-chip microcomputer during the level signal transmitted by the first pin The feet are sampled multiple times, and the conductivity is calculated according to the sampled values. The invention not only can effectively avoid the problem of liquid polarization, but also 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 liquid conductivity, in particular to a method for measuring liquid conductivity. Background technique [0002] With the rapid development of industrial and agricultural production, as well as with the production and life of human beings, the measurement of the conductivity of solutions has become a very important topic. For example, in the field of new energy vehicles, the conductivity measurement of the solution in the lithium battery on the electric vehicle is a key technology, which affects the energy utilization rate of the electric vehicle, as well as the cruising 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, and water quality testing plays a vital role in water pollution control and the protection of the entire water environment. For example, if the content of fluorine in drinking water is...

AI Technical Summary

Problems solved by technology

which 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 at a high or low resolution. 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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