What should I do if the electrode of the electromagnetic flow meter is dirty?

Abstract: What should I do if the electrode of the electromagnetic flow meter is dirty? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. As an indispensable product in industrial production, instrumentation has been widely used in daily life. However, as a precision instrument, flowmeter has many points that need to be paid attention to in use and daily maintenance. Electromagnetic flowmeter is a kind of wisdom. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is what should I do if the electrodes of the electromagnetic flowmeter are dirty? Article details. As an indispensable product in industrial production, instrumentation has been widely used in daily life. However, as a precision instrument, flowmeter has many points that need to be paid attention to in use and daily maintenance. Electromagnetic flowmeter is an intelligent instrument, and its maintenance is particularly important. If the medium measured by the electromagnetic flowmeter is relatively dirty for a long time, after the electromagnetic flowmeter works for a period of time, dirt will be generated on the electrodes. When the conductivity of the fouling substance is different from the conductivity of the measured medium, it will bring about measurement errors. The adhesion of sludge and oil to the electrodes will also cause the output of the instrument to swing and drift. Therefore, in this case, we need to regularly maintain and clean the electromagnetic flowmeter electrodes. The following will introduce several cleaning methods of electromagnetic flowmeter electrodes. 1. Mechanical removal method The mechanical removal method realizes electrode removal by installing a special mechanical structure on the electrode. There are currently two forms: one is to use a mechanical scraper, a scraper with a thin shaft made of stainless steel, and the scraper is drawn out through a hollow electrode. When the thin shaft is rotated from the outside, the scraper rotates against the plane of the electrode end to scrape off the dirt. This scraper can be used manually or automatically with a motor-driven thin shaft. The other is in the tubular electrode, with a wire brush for cleaning dirt, and the shaft is wrapped in a sealed O-ring to prevent fluid leakage. This cleaning device requires someone to frequently pull the wire brush to clean the electrodes, which is not very convenient to operate. 2. Electrochemical methods Metal electrodes have electrochemical phenomena in electrolyte fluids. According to the principle of electrochemistry, there is an interfacial electric field between the electrode and the fluid, and the interface between the electrode and the fluid is caused by the electric double layer existing between the electrode/fluid phase. The study of the electric field at the interface between the electrode and the fluid found that the molecules, atoms or ions of the substance have enriched or poor adsorption at the interface, and found that most inorganic anions are surface active substances with a typical ion adsorption law, while the surface of inorganic cations activity is small. Therefore, electrochemical cleaning of electrodes only considers the case of anion adsorption. The adsorption of anions is closely related to the electrode potential, and the adsorption mainly occurs in the potential range that is more positive than the zero-charge potential, that is, the electrode surface with the opposite sign. On the electrode surface of the same charge, when the residual charge density is slightly larger, the electrostatic repulsion is greater than the adsorption force, and the anions are quickly desorbed, which is the principle of electrochemical cleaning. 3. Ultrasonic cleaning method The ultrasonic voltage of 45~65kHz generated by the ultrasonic generator is applied to the electrode, so that the energy of the ultrasonic wave is concentrated on the contact surface between the electrode and the medium, so as to use the ability of the ultrasonic wave to crush the dirt and achieve the purpose of cleaning. 4. Electric breakdown method This method uses alternating high-voltage electricity to be regularly added between the electrode and the medium, generally 30~100V. Because the electrode is attached, its surface contact resistance becomes larger, and the applied voltage is almost concentrated on the attached object. The high voltage will break down the attached object and then be washed away by the fluid. From the perspective of safety, the use of the electric breakdown method must be to clean the AC high voltage directly on the sensor signal output terminal under the condition of interrupted measurement of the flowmeter, disconnection of the signal line between the sensor and the converter, and power failure. Regular cleaning of the electrodes will prolong the life of the electromagnetic flowmeter. It should be known that once the electromagnetic flowmeter fails, the maintenance cost will be relatively high. Only by performing regular maintenance in normal use can unnecessary losses be reduced and the value of the product expanded. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'What should I do if the electrode of the electromagnetic flow meter is dirty? 》
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