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1. What is the working principle of an electromagnetic flowmeter? The working principle of an electromagnetic flowmeter is based on Faradays law of electromagnetic induction, which calculates flow velocity and flow rate by measuring the induced electromotive force generated by the motion of a conductive fluid in a magnetic field. 1. Core principle: When a conductive fluid (such as water, acid, alkali, slurry, etc.) flows through a stable magnetic field generated by an excitation coil, the fluid acts as a moving conductor and cuts magnetic induction lines. According to Faradays law of electromagnetic induction, an induced seepage electromotive force (E) will be generated in a direction perpendicular to both the magnetic field and the fluid flow direction. Its size can be represented by the formula E=k B D v, where: • E: induced electromotive force (V) • k: instrument constant • B: magnetic induction intensity (T) • D: inner diameter of the measuring tube (m) • v: average flow velocity of the fluid (m/s) 2. System composition: An electromagnetic flowmeter is mainly composed of the following four parts: • Measuring tube: It is lined with insulating materials (such as polytetrafluoroethylene, rubber) to prevent the induced electromotive force from being short circuited. Excitation system: composed of a pair of excitation coils, used to generate a stable or alternating magnetic field. Electrode: Typically a pair of metal electrodes installed tightly against the inner lining, used to detect the induced electromotive force generated by the fluid. • Converter: The core signal processing unit amplifies, filters, and calculates the weak voltage signal detected by the electrode, and finally converts it into a standard flow sign
2. Working principle of electromagnetic flowmeter
Electromagnetic flowmeter is a flow measurement device based on Faradays law of electromagnetic induction. It accurately calculates the flow rate by measuring the induced electromotive force generated when a conductive liquid flows in a magnetic field.
. The following is a detailed explanation of the working principle of an electromagnetic flowmeter: Firstly, it generates a uniform magnetic field around the measuring pipeline through a magnetic field generator (coil). The magnetic field can be a constant direct current or an alternating electromagnetic field. Subsequently, the conductive liquid to be tested passes through the electrodes inside the pipeline, and the direction of the liquid flow should be matched with the flow meter design to ensure the accuracy of the measurement. According to Faradays law of electromagnetic induction sliding, when a conductive liquid passes through a magnetic field, the charge carriers in the liquid will be affected by the magnetic field force, generating induced electromotive force. The magnitude of this electromotive force is directly proportional to the liquid flow rate. The electromagnetic flowmeter is equipped with electrodes inside, which are used to directly contact the liquid and measure the induced electr