As an indispensable product in industrial production, instrumentation has been widely used in daily life. However, as a precision instrument, flowmeters have many areas that require attention in daily use and maintenance. Electromagnetic flowmeters are smart meters whose maintenance is particularly important.
Electromagnetic Flowmeter If the measured medium is relatively dirty for a long time, then after the electromagnetic flowmeter has been working for a period of time, dirt will be generated on the electrodes. When the conductivity of the fouling material is different from the conductivity of the measured medium, measurement errors will result. The attachment of sludge and oil to the electrode will also cause the meter output to swing and drift. Therefore, in this case we need to regularly maintain and clean the electromagnetic flowmeter electrodes. The following describes the cleaning method of several electromagnetic flowmeter electrodes.
Mechanical removal method
The mechanical removal method is achieved by installing a special mechanical structure on the electrode to achieve electrode removal. There are currently two forms:
One is the use of a mechanical scraper, made of a stainless steel knife with a thin shaft, through the hollow electrode lead out. When turning the thin shaft from the outside, turn it close to the electrode end surface to scrape off dirt. The scraper can be manually or automatically scraped by a motor-driven fine shaft.
The other is in the tubular electrode, equipped with a wire brush to remove dirt, and the shaft is wrapped in a sealed O-ring to prevent fluid leakage. This type of cleaning device requires someone to frequently pull the wire brush to clean the electrode, which is not very convenient to operate.
2. Electrochemical methods
The metal electrode has an electrochemical phenomenon in the electrolyte fluid. According to the electrochemical principle, there is an interface electric field between the electrode and the fluid, and the interface between the electrode and the fluid is caused by the double electric layer existing between the electrode/fluid phase. The study of the electric field at the interface between the electrode and the fluid reveals that the molecules, atoms, or ions of the material are enriched or poorly adsorbed at the interface, and it is found that most of the inorganic anions are surface-active substances that have typical ion adsorption laws and the surface of inorganic cations. Very little activity. Therefore, the electrochemical cleaning electrode only considers the anion adsorption. Adsorption of anions is closely related to the potential of the electrode. The adsorption takes place mainly in the potential range that is more positive than the zero charge potential, ie, the surface of the electrode with an opposite charge. On the surface of the electrode with the same charge, when the residual charge density is slightly larger, the electrostatic repulsive force is greater than the adsorption force, and the anion desorbs quickly. This is the principle of electrochemical cleaning.
3. Ultrasonic cleaning method
Ultrasonic voltage of 45~65kHz generated by the ultrasonic generator is added to the electrode, so that the energy of the ultrasonic wave is concentrated on the contact surface of the electrode and the medium, so that the ability of the ultrasonic wave is used to break the dirt and achieve the purpose of cleaning.
4. Electric breakdown method
This method uses AC high-voltage electricity periodically added between the electrode and the medium, generally adding 30~100V. As the electrode is attached, its surface contact resistance becomes larger, the applied voltage is almost concentrated on the attached matter, and the high voltage breaks down the attached matter and is then washed away by the fluid. From the viewpoint of safety, the use of electrical breakdown must be performed on the sensor signal output terminals by cleaning the AC high-voltage power when the flowmeter interrupts the measurement and the signal line between the sensor and the converter is disconnected.
Periodic cleaning of the electrodes will extend the life of the electromagnetic flowmeter. It should be noted that once the electromagnetic flowmeter fails, the cost of maintenance will be relatively high. Only regular maintenance during normal use can reduce unnecessary losses and increase the value of the product.
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