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An electromagnetic flowmeter measures flow rate by utilizing Faraday’s law of electromagnetic induction. Its working principle is similar to that of a transformer: a power source supplies current to the excitation coil, and this excitation current generates a magnetic field within the coil. This magnetic field acts on the conductive medium, creating an induced electromotive force. Finally, a voltage signal proportional to the flow velocity of the fluid being measured is obtained from the electrodes. Schematic diagram of the working principle of an electromagnetic flowmeter. An electromagnetic flowmeter usually consists of a sensor and a converter. The flow rate of the fluid under measurement is converted into an induced electromotive force by a sensor, and this induced electromotive force is then transformed by a converter into a standard 4-20 mA DC signal for display or control purposes. Its structure is shown in Figure 1. http://yunrun.com.cn/upload/201807/15/201807151725192870.png Basic structure diagram of electromagnetic flowmeters. After gaining a basic understanding of the working principle and basic structure of electromagnetic flowmeters through these two diagrams, instrument technicians also need to master the skills required for selecting appropriate electromagnetic flowmeters based on actual operating conditions, as well as for repairing them. For professional knowledge related to the selection of electromagnetic flowmeters, please visit http://yunrun.com.cn/product/176.html; for information on repair techniques, refer to the relevant technical articles in our website’s technical database