Electromagnetic flowmeter principle and its application technology in the industrial field

Project Overview

　　Electromagnetic flow meter is a sensor used to measure the flow of conductive liquids. Its working principle is based on Faraday's Law of Electromagnetic Induction, which states that when a conductive liquid passes through a pipe, it will cause an electromagnetically induced electromotive force in the liquid, and the flow rate of the liquid can be calculated by measuring the induced electromotive force in the liquid and the strength of the magnetic field. This type of flowmeter is widely used in industrial fields, including chemical, petroleum, food and pharmaceutical industries.

　　Electromagnetic flowmeter consists of two parts: sensor and transmitter. The sensor is mounted on the pipeline and flows the liquid through a pair of opposing electrodes and applies a magnetic field perpendicular to the direction of liquid flow. As the liquid flows, the conductive material in the liquid generates an electric potential, the magnitude of which is proportional to the liquid flow rate. The sensor measures this electromotive force and converts it to a standard electrical signal, such as 4-20 mA or 0-10 volts, via a transmitter.

　　The advantages of electromagnetic flowmeter are high measurement accuracy, good stability, fast response time, no moving parts, not easily affected by factors such as fluid properties and temperature. It can measure the flow of various conductive liquids, including corrosive liquids, high temperature liquids, high viscosity liquids and dirty liquids. At the same time, it can also be used to measure the flow of smaller liquids, such as acid wash and solution.

　　Supmea Electromagnetic Flow Meter Pictures

　　In the chemical industry, electromagnetic flowmeters are widely used in various process control and flow monitoring tasks. For example, in the manufacture of nitric acid, electromagnetic flow meters can be used to monitor the mixing ratio of dilute and concentrated nitric acid to ensure production quality. In the petroleum industry, electromagnetic flow meters can be used in the process of oil well water injection to monitor the volume and quality of water injection, thus improving the oil recovery efficiency of oil wells.

　　In addition to applications in the industrial field, electromagnetic flowmeter can also be used in environmental monitoring and water conservancy projects. For example, in urban drainage systems, electromagnetic flow meters can be used to measure the flow and quality of sewage for treatment and management. In water conservancy engineering, electromagnetic flowmeter can be used to measure the flow and water level of rivers and lakes for hydrological prediction and flood management.

　　Of course, electromagnetic flowmeter has some limitations. First, it can only measure the flow of conductive liquids, for non-conductive liquids can not be measured. Secondly, since air bubbles or solid particles in the liquid will affect the measurement of electromagnetic induction electromotive force, it is necessary to take some measures to eliminate these effects, such as increasing the distance between electrodes or installing filters for air bubbles and solid particles. In addition, for high temperature, high pressure, high viscosity and corrosive liquids and other special circumstances, you also need to choose the appropriate electromagnetic flowmeter model.

　　In general, the electromagnetic flowmeter is a high-precision, high-reliability flow measurement sensor, and its application in the industrial field continues to expand. With the continuous progress of technology, electromagnetic flowmeter measurement accuracy and applicability will continue to improve, for industrial automation and process control to bring more convenience and benefits.