A Rotating Liquid Conductivity Measuring Electrode

Abstract

The invention discloses a rotary type liquid conductivity measurement electrode. The rotary type liquid conductivity measurement electrode consists of two electrode bodies, two gaskets, two slip rings, a miniature motor and fixing screws, wherein the two electrode bodies are cylindrical flat-bottom straight barrels with unequal diameters; a gap is reserved between cylindrical side walls of the two straight barrels; notches are formed in each straight barrel at intervals so that a plurality of electrode claws are formed on the cylindrical side walls of the two electrode bodies; a screw mounting hole is formed in the center of a flat bottom of each electrode body; screw holes which are matched with the fixing screw are formed in the axis position of an outputting shaft of the miniature motor; the fixing screws penetrate in the screw mounting holes of the various components, and are fixedly screwed in the screw holes of the outputting shaft of the miniature motor; the first electrode body is electrically connected with the second slip ring; the second electrode body is electrically connected with the first slip ring; and the electrode claws on the two electrode bodies face to each other one by one in the radial direction. According to the technical scheme, the rotary type liquid conductivity measurement electrode is characterized in that ions cannot be gathered or adhered to the surface of the electrode, a stable double-electrode layer is formed, and electrode polarization is avoided.

Description

technical field [0001] The technical proposal relates to a measuring electrode for liquid conductivity or resistivity, in particular to a liquid conductivity or resistivity measuring electrode capable of completely eliminating electrode polarization. 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 liquid conductivity is to measure the voltage U applied to the two ends of the electrode placed in the liquid 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 a liquid, where K is the cell constant. However, the electrodes placed in the liquid will be polarized after being energized, so that the measured voltage U is not actually the voltage at both ends of the liquid itself, but the voltage applied to the two virtual electronic devices of the...

AI Technical Summary

Problems solved by technology

However, the electrodes placed in the liquid will be polarized after being energized, so that the measured voltage U is not actually the voltage at both ends of the liquid itself, but the voltage applied to the two virtual electronic devices of the liquid 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 measurement accuracy, the basic method is to apply positive and negative polarity symmetrical alternating currents such as sine waves on the electrodes for excitation, but the alternating current excitation method It can only reduce the influence of electrode polarization, but cannot completely eliminate the influence of electrode polarization, and AC excitation will introduce the unfavorable factors of electrode inter-electrode capacitance and electrode lead capacitance to the measurement

Images