How to clean the electromagnetic flowmeter, the metal electrode in the electrolyte liquid has the electrochemical status.According to the principle of electrochemistry, the page electromagnetic field is stored in the level and liquid, and the page of the level and liquid is caused by the double layer of the level and liquid.
Three ways to easily clean the electromagnetic flowmeter level dirt
Electrochemical mode
The metal electrode has an electrochemical state in the electrolyte liquid.According to the principle of electrochemistry, the page electromagnetic field is stored in the level and liquid, and the page of the level and liquid is caused by the double layer of the level and liquid.The study of electrolevel and liquid page electromagnetic field found that the molecules, atoms or ions of chemical substances in the page have the concentration or poor adsorption status, and found that most inorganic cations are surface active chemical substances, with a typical ion adsorption law, while the surface activity of inorganic cations is very small.
Therefore, the electrochemical cleaning level only considers the case of cation adsorption.The adsorption of cations is closely related to the electrode potential, and the adsorption mainly occurs in the range of potential changes over the zero charge potential, that is, the surface of the electrical level with different sign charge.On the surface of the electrical level of the same sign charge, when the residual electron density is slightly higher, the electrostatic repulsion force is greater than the absorption force, the cation is desorbed quickly, this is the principle of electrochemical cleaning.
Mechanical equipment elimination method
The mechanical equipment elimination method is based on the installation of a special mechanical structure on the electromagnetic flowmeter to maintain the electrical level elimination.At present there are two forms: one is to choose mechanical equipment scraper.Stainless steel made of a scraper with a thin shaft, according to the hollow electrical level of the scraper out, thin shaft and hollow electrical level between the selection of mechanical seal to prevent the outflow of material, so formed a mechanical equipment scraper.When rotating the thin shaft from the outside, the scraper rotates close to the electrode plane to remove dirt.The scraper can be operated manually or automatically by using a motor to drive a thin shaft.Domestic electromagnetic flowmeter Chinese and western an yunyi scraper electromagnetic flowmeter will have such a performance, and the performance is stable, easy to operate.The other is in a tubular electrical stage with a wire brush for dirt removal and the shaft wrapped in a sealed "O" ring to prevent fluid leakage.This cleaning equipment requires someone to often pull the wire brush to clean the electrical level, the operation is not very convenient, not as convenient as the xi 'an yunyi scraper electromagnetic flowmeter.
Ultrasonic cleaning method
The ultrasonic voltage of 45~65kHz generated by the ultrasonic generator is applied to the electrical level, so that the ultrasonic energy is concentrated on the contact surface between the electrical level and the material, so as to use the ultrasonic power to smash the dirt and achieve the purpose of cleaning.
Electrothermal breakdown
In this way, the ac high voltage tower is regularly added to the electrical level and the material, usually 30~100V.As the electrical stage is attached, the surface contact resistance becomes larger, and the applied voltage is almost concentrated on the attachment. The high voltage will thermal breakdown the attachment and then be washed away by the liquid.Starting from the general safety, the electric breakdown method must be used to clean the ac high voltage tower directly on the sensor signal output terminal in the case of interruption measurement of the flowmeter, signal line disconnection between the sensor and the converter, and power failure.
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