Measurement principle of electromagnetic flowmeter

『Measurement principle of electromagnetic flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

1. Working principle and selection of electromagnetic flowmeter

Working principle of electromagnetic flowmeter The measurement principle of electromagnetic flowmeter is based on Faradays law of electromagnetic induction. The sensor part consists of a coil, electrodes, and insulating lining. The specific working process is as follows: magnetic field generation: the excitation coil in the sensor generates a magnetic field perpendicular to the direction of fluid flow after being energized. Induced electromotive force generation: When a conductive fluid passes through a magnetic field, a small induced electromotive force is generated in the fluid due to the cutting of magnetic field lines. Signal acquisition and processing: The electrode collects the induced electromotive force and sends it to the converter section. The converter amplifies and corrects the signal, converts it into corresponding flow data through formulas, and finally displays it on the instrument or code year output to the upper computer system. When the conductive fluid flows through a magnetic field perpendicular to the direction of flow, it induces an induced voltage E proportional to the average flow velocity, which is calculated as E=KBVD. Among them, E is the induced voltage, K is the instrument constant, B is the magnetic induction intensity, V is the average flow velocity inside the measuring tube surface, and D is the diameter of the flowmeter. The induced voltage is detected through two electrodes in direct contact with the fluid, amplified, filtered, and shaped by a converter, and then sent to the MCU to complete the display and output control of instantaneous flow rate and cumulative flow rate. Key points for selecting electromagnetic

flow meters: Measurement accuracy: A high-quality electromagnetic flow meter should have high measurement accuracy. Currently, the accuracy of electromagnetic flow meters is generally 0.3 or 0.5 levels, and some small-diameter products can reach 0.2 levels. Dielectric conductivity: Due to the particularity of the measurement principle, electromagnetic flowmeters require the measured medium to have a certain conductivity, generally greater than 5 μ S/cm. Initial flow velocity: There are certain requirements for the initial flow velocity during measurement, usually greater than 0.5m/s. Product performance and stability: Choose electromagnetic flow meters with stable product performance, such as the SL7100 series intelligent electromagnetic flow meter, developed using advanced technology at home and abroad, which has the characteristics of high measurement accuracy, high reliability, good stability, and long service life. Product design and manufacturing process: Focus on the quality of products in structural design, material selection, manufacturing process, production assembly, and factory testing. For example, the SL7100 series pays attention to every aspect of the production process, with a water tower of up to 35M as a stabilizing device for flow calibration, as well as professional production equipment lines and specialized large-scale production software and hardware, ensuring long-term high-quality products. Display and operation functions: Choose products with intuitive display and convenient operation, which can reduce the trouble of on-site installation, use, and maintenance. The SL7100 series is designed with a backlit wide temperature LCD display in both Chinese and English, which is fully functional and practi

Measurement principle of electromagnetic flowmeter

1. Working principle and selection of electromagnetic flowmeter

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