In recent years, with the rapid development of modern information and digital technology, as well as the upgrading of human electronic manufacturing technology, the product quality, reliability, and functionality of various electronic instruments and meters have been greatly improved. The upgrading and replacement of electromagnetic flowmeter products described in this article also witnesses this process. Electromagnetic flowmeter is widely used in various petrochemical enterprises, urban water supply, sewage treatment and other projects, with advantages such as simple structure, wide range, and corrosion resistance. The accuracy of electromagnetic flowmeter is a key indicator reflecting the quality of electromagnetic flowmeter products, which is closely related to the accuracy of measurement results. Starting from the development history of electromagnetic flowmeters, this article provides a more in-depth analysis of their four development directions, which are manifested in the structure of electromagnetic flowmeters, the excitation method of electromagnetic flowmeters, the signal processing method of electromagnetic flowmeters, and the intelligent technology of electromagnetic flowmeters. This article discusses the current status and future directions of technological development in these four aspects, as well as the future trends of electromagnetic flow meters. Today, with the continuous development and improvement of intelligent technology, the future electromagnetic flowmeter will still focus on excitation optimization and signal processing technology, while constantly changing the structure of the electromagnetic flowmeter to adapt to increasingly complex measurement environments and meet the trend of personalized measurement requirements.

A flowmeter is an instrument that uses physical principles to measure fluid flow over a period of time. Electromagnetic flow meters have the advantages of wide range, corrosion resistance, and simple structure, and are currently popularOne of the types of flow meters. The theory of electromagnetic flow meters originated in the 1920s. Most contemporary electromagnetic flow meters are based on computer technology, and their functions are enhanced with the increasing information processing, storage, computing, and control capabilities of computers. The four directions of technological innovation in electromagnetic flow meters are worth paying attention to: the structure of electromagnetic flow meters, the excitation method of electromagnetic flow meters, the signal processing technology of electromagnetic flow meters, and the intelligence of electromagnetic flow meters. This article takes this as a clue to summarize the development history of electromagnetic flowmeters and analyze their development trends.

Capacitive electromagnetic flowmeter

Capacitive electromagnetic flowmeter fundamentally solves the problems of electrode surface adhesion, corrosion, friction, etc. Its electrode is isolated from the measured fluid by an insulating lining or directly uses an insulated measuring tube. The electrode is placed outside the measuring tube or embedded inside the measuring tube. Structure of embedded electromagnetic flowmeter and externally mounted electromagnetic flowmeter