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A kind of electrode rotating type liquid conductivity measurement method

A measurement method and rotary technology, applied in the direction of measurement device, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problems of inability to completely eliminate the influence of electrode polarization, adverse influence of measurement, theoretical error, etc.

Active Publication Date: 2017-05-17
FUJIAN NORMAL UNIV
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Problems solved by technology

However, the electrodes placed in the solution will be polarized after being energized, so that the measured voltage U is not actually the voltage at both ends of the solution itself, but the voltage applied to the two virtual electronic devices of the solution resistance series electrode polarization equivalent capacitance Voltage, so there is a theoretical error in the formula R=U / I; in order to reduce the influence of electrode polarization on the measurement accuracy, the common method is to apply positive and negative polarity symmetrical alternating current such as sine waves on the electrodes for excitation, but AC excitation The method can only reduce the influence of electrode polarization, but cannot completely eliminate the influence of electrode polarization, and AC excitation will introduce the adverse effects of electrode inter-electrode capacitance and electrode lead capacitance on measurement

Method used

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Embodiment Construction

[0009] Below in conjunction with accompanying drawing, the technical scheme of the present application is further described:

[0010] figure 1 Among them, 1 and 2 represent the two electrode terminals of the measuring electrode, which are called the first electrode terminal 1 and the second electrode terminal 2. Except for extreme 1, the two electrode ends remain coaxial, and a proper gap is left between the cylindrical side walls of the two electrode ends, such as figure 2 As shown, the same number of gaps are equally spaced on the straight cylindrical side walls of the two electrode ends, so that the same number of electrode claws are formed on the cylindrical side walls of the two electrode ends; figure 1 , there is a screw installation hole in the center of the flat bottom of the two electrode ends; the two gaskets, namely the first gasket 4 and the second gasket 6, are electrically insulated, and there are screw installation holes in the center of the two gaskets holes...

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Abstract

The invention discloses an electrode rotating type liquid conductivity measuring method. By adopting a miniature motor, tested liquid can quickly and cyclically run through a gap between electrode claws of two electrode terminals in the circumference direction, and the electrode claws of the electrode terminals can be scoured, so that ions cannot be accumulated and attached to the surface of measuring electrodes, and a stable double electrode layer is formed. Polarization of the electrodes is avoided, and by adopting direct-current voltage for excitation, methods for testing and computing are simple and reliable, the effects of distribution capacitance between the electrodes and the leads of the electrodes can be ignored and interference resistance is high.

Description

technical field [0001] The technical proposal relates to a method for measuring liquid conductivity or resistivity, in particular to a method for measuring liquid conductivity or resistivity that can completely eliminate electrode polarization and adopt direct current excitation. Background technique [0002] The measurement of liquid conductivity is widely used in many fields such as industrial production and water quality monitoring. The basic measurement method of solution conductivity is to measure the voltage U applied to the two ends of the electrode placed in the solution and the current I flowing through the electrode, and calculate the resistance between the electrodes R=U / I, calculated by G=K / R The conductivity of the solution, where K is the cell constant. However, the electrodes placed in the solution will be polarized after being energized, so that the measured voltage U is not actually the voltage at both ends of the solution itself, but the voltage applied to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
Inventor 廖晓东洪亲林宏心
Owner FUJIAN NORMAL UNIV
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