Electromagnetic flowmeter is a new type of flow measuring instrument developed rapidly with the development of electronic technology. Because it is not affected by physical parameters such as temperature, viscosity, and pressure, electromagnetic flowmeters have many advantages such as no resistance parts in the pipeline and significant energy-saving effects. They have been favored by many domestic and foreign manufacturers, and have now developed into the four major industrial applications. One of the flow meters.
At present, the existing electromagnetic flowmeters generally use a single-chip microcomputer as the core controller, using dot-matrix liquid crystal display, small-capacity EEPROM to store data, and their measurement accuracy, man-machine operation, information storage, etc. have certain limitations. , It can no longer meet the needs of flow measurement and control in actual industrial production. For this reason, this paper proposes a design based on ARM-Linux embedded development platform, using MINIGUI development environment to design graphical user interface (CUI). The design provides a friendly man-machine interface, a large amount of data storage and management, and network communication functions, and realizes the intelligent, informatized and networked electromagnetic flowmeter.
The flow meter is mainly composed of three parts: a flow measurement unit, an intelligent monitoring terminal and a remote host. The instrument integrates technologies such as embedded technology, database, graphics development, and network into the traditional electromagnetic flowmeter to build a comprehensive system that integrates flow measurement, data storage and management, and remote monitoring.
The flow measurement unit includes modules such as excitation circuit, flow signal processing circuit and memory. It mainly completes the high-precision measurement of the flow, and transmits the processed data information to the intelligent monitoring terminal through the Modbus bus. The intelligent monitoring terminal runs on-site monitoring software based on the LCD touch screen, and performs on-site real-time monitoring of the entire electromagnetic flowmeter system, realizing various functions such as meter parameter setting, serial port setting, flow and potential calibration, and provides a friendly man-machine interface, Data management and network services.
The remote host can log in to the remote monitoring system of the electromagnetic flowmeter via Ethernet, and perform operations such as real-time viewing of flow information, data query and user management.
The hardware design of intelligent monitoring terminal mainly includes the design of control module, storage module and peripheral interface module.