How to avoid the surface effect of the electrode in the electromagnetic flow meter

Abstract: The information on how to avoid the surface effect of the electrode of the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Abstract: The so-called electrode surface effect refers to four aspects: chemical reaction effect on the electrode surface, electrochemical phenomenon, polarization potential and the catalytic effect of the electrode. In the use of the electromagnetic flowmeter, some of the above conditions will occur, which will affect the normal use of the user. This article. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on how to avoid the surface effect of the electromagnetic flowmeter. The so-called electrode surface effect refers to four aspects: chemical reaction effect on the electrode surface, electrochemical phenomenon, polarization potential and the catalytic effect of the electrode. In the use of electromagnetic flowmeters, the above situations will occur, which will affect the normal use of users. This article aims at these problems and discusses with you how to avoid the occurrence of the above problems. How to avoid the surface effect of the electrode in the electromagnetic flowmeter The so-called surface effect of the electrode refers to the four aspects of the chemical reaction effect on the surface of the electrode, the electrochemical phenomenon, the polarization potential and the catalytic effect of the electrode 1. Chemical reaction effect: refers to the contact between the electrode and the measured medium Afterwards, a passivation film or oxide layer is formed on the surface of the electrode. At this time, the electrode is not corroded, but the formed passivation film or oxide layer increases the contact resistance of the electrode surface. For example, tantalum and water tantalum are corrosion-resistant to water. It is wrong to choose tantalum electrode to measure water flow, because when measuring water flow, an insulating layer will be formed on the surface of tantalum electrode to block the transmission of induced voltage. 2. Electrochemical phenomenon: It means that the electrode is in contact with the measured medium, and the potential of the electrode surface changes. For example, when measuring the fluid flow of sand-containing solid particles or fiber slurry, the solid particles wipe the electrode, and although the electrode is not corroded, the contact potential of the impacted surface of the electrode changes suddenly, causing the output signal of the instrument to appear spikes and form interference. In the case of fruit juice measurement, a high-frequency converter is used. 3. Polarization potential: It means that the electrode-induced electromotive force has different polarities between the two electrodes, resulting in the polarization of the electrolyte on the electrode surface. Early electromagnetic flowmeters used DC excitation electrodes with serious polarization. Now, low-frequency square wave excitation is often used. Low-frequency rectangular wave excitation combines the advantages of DC excitation and AC excitation. Although alternating excitation reduces the polarization potential by several orders of magnitude, However, the influence of polarization potential interference cannot be completely eliminated. 4. Catalyst effect: It means that the measured medium produces a chemical reaction under the action of the electrode and affects the measurement. For example, when a platinum electrode electromagnetic flowmeter measures hydrogen peroxide, although the platinum electrode is not corroded, the hydrogen peroxide will generate aerosol on the electrode surface, blocking the electrical path, and causing the output signal to fluctuate. For example, platinum and hydrogen peroxide are corrosion-resistant to hydrogen peroxide. It is wrong to choose a platinum electrode to measure the flow rate of hydrogen peroxide. This is because when measuring hydrogen peroxide under low pressure (0.3Mpa), the surface of the electrode will produce aerosol and block the electrical path. Measurement. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to avoid the surface effect of the electrode of the electromagnetic flow meter'
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