Electromagnetic Flow Meter: Analysis & Prospect of Core Technology for Flow Measurement
Introduction: From Faraday’s Law to Industrial Measurement In 1831, Michael Faraday discovered the phenomenon of electromagnetic induction, which not only changed the way humans use energy, but also opened up a new path for flow measurement technology. More than a century later, electromagnetic flowmeters based on this principle were born and became indispensable measuring instruments in the process industry. This article will delve into the working principle, technical characteristics, and innovative applications of electromagnetic flow meters, showcasing the core value of this technology. 1、 Basic principle: Clever application of electromagnetic induction in flow measurement The working principle of electromagnetic flowmeter is essentially the specific implementation of Faraday’s law of electromagnetic induction in fluid measurement. When a conductive fluid flows in a magnetic field, it is equivalent to a conductor cutting a magnetic induction line, thereby generating an induced electromotive force between two electrodes perpendicular to the magnetic field and flow direction. There is a strict mathematical relationship between the magnitude of this electromotive force and fluid flow velocity, magnetic field strength, and measured pipe diameter: E = kBDv Among them, E is the induced electromotive force, B is the magnetic induction intensity, D is the inner diameter of the measuring...
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