Swinging liquid conductivity measurement electrode

Abstract

Disclosed is a swinging liquid conductivity measurement electrode. The swinging liquid conductivity measurement electrode comprises a first electrode end, a second electrode end, an electrode arm, a swinging mechanism, a lead and a connection terminal. The first electrode end and the second electrode end are metal plates, are parallel to each other and face each other directly, and a gap is reserved between the first electrode end and the second electrode end. The first electrode end and the second electrode end are fixedly mounted on the electrode arm and are mechanically connected to the swinging mechanism through the electrode arm. The first electrode end and the second electrode end penetrate an internal hollow portion of the electrode arm to be electrically connected to the connection terminal poisoned at a swinging axis portion of the swinging mechanism through the lead. The swinging liquid conductivity measurement electrode has the advantages that ions cannot accumulate on and adhere to the surface of the electrode and stable double electrode layers are formed, so that 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...

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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

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