Electromagnetic water meter is a new type of full -electronic intelligent water meter. It has the characteristics of high performance, low pressure loss, long life and other characteristics. It is an important terminal used by IoT technology in the water supply system. The core is the flow sensor that uses electromagnetic induction. The electrode is an important part of picking up the signal in the sensor and is directly in contact with the test medium.
The pressure, temperature, and corrosiveness of fluid media will have a different degree of impact on metal electrodes. The process and maintenance of the electrode is a hot topic in the industry, but there are no literature reports to explain the principles in depth. Studying the principle of extreme interference of metal electrodes, proposing improvement technology, which has important guiding significance for improving the sensor's signal -to -noise ratio, especially the measurement expansion range of micro -current inspirational electromagnetic water meters.
General behavior of electrode polarization:
Different metal conductors can generate different potentials, called contact potential. From the perspective of solid energy with theory, because the Fermi -energy levels of the two metals are different (the Z high of the electrons in the guide zone occupies the energy level, that is, the collection of the separate interface of the electron and the non -possessive electronic area represents the chemistry of the electronics ), When two metals are in contact, they can exchange electronics, from high chemical potential to low chemical electronics, generate contact potential. One of the typical applications of this chemical energy into electrical energy is the original battery effect of the metal, and its inverse process is an electrolytic battery. Both processes are related to the behavior of metal electrodes in water.
The original battery includes two semi -battery reactions, namely anode reactions and cathode reactions. Among them, the anode (negative electrode) lost the oxidation reaction of electrons, resulting in a rise in the potential, and the cathode (positive pole) was reacted by the electrons, and its potential decreased. The electrolytic battery is the opposite and transforms electrical energy into chemical energy. Generally, the two electrodes are metal of the same material, that is, Fermi can be almost the same. If there is no external power supply, electronic transfer will not occur. When the two metal electrodes are placed in an electrolyte and connected to the external power, the liquid medium is electrolytic. Electronics forms current from the electrode (positive) to the low -electrocable electrode (positive pole) to the low -electrode electrode (negative pole).
At this time, the electrochemical semi -reaction (micro -battery) anode (orthopedic) lost electrons near the two electrodes of the two electrodes. Therefore, with the accumulation of time, the positive momentum continues to rise, and the potential of the negative electrode continues to decrease, which is equivalent to forming a battery connected in the same direction in the same direction as the external power supply. This is exactly what the signal electrode under the measured liquid under the measured liquid of the water flow electromagnetic detection technology is polarized in the measured liquid. When the current is too long, the electrode potential deviates from its balanced potential is called the polarization of the electrode. At this time, the polarization potential is superimposed to the signal potential, which will cause DC interference.
