Research & Develope The Intelligent Electromagnetic Flowmeter System

On the base of analyzing the development status and trend of the electromagnetic flowmeter technology, this article uses new MCU and IC to design the intelligent electromagnetic flowmeter that has a conversion instrument and a cumulation apparatus. In the course of exploiting the system hardware, we adopt the low frequency sine wave excitation technology whose frequency is alterable, and scheme out the new signal conversion & amplifying circuit, the new LCD circuit and the new system anti-interference circuit. In the course of exploiting the system software, we creatively put forward a double circulation message drive programming idea, and work out the electromagnetic flowmeter system software with it. Furthermore, we not only ameliorate the current fixed point numbers multiplication & division arithmetic, but also make a valuable research on how to apply electromagnetic flowmeter to the sewage monitoring network system. The development of this item will be beneficial to improving the electromagnetic flow measure technology of our country.Chapter one: Firstly, summarizes the basic theory of the electromagnetic flowmeter and its technology development status all over the world; Afterwards, discusses the significance and necessary of designing a new generation intelligent electromagnetic flowmeter, according to its current defect; finally, gives the study content and configuration arrangement of this dissertation.Chapter two: Firstly, confirms the designing principle through analyzing the assignment of this item; Afterwards, through studying, analyzing, comparing and demonstrating the pivotal technology of the electromagnetic flowmeter, ascertains the technology actualization scheme of system designing; Finally, according to the assignment, the designing principles, the technology actualization scheme, and the electromagnetic flowmeter development trend, puts forward the collectivity config--uration of the intelligent electromagnetic flowmeter system.Chapter three: introduces the design of the electromagnetic flowmeter hardware system, lays stress on analyzing the conversion & amplifying circuit, the excitation sine wave occurring circuit, the analog-digital conversion circuit, the keyboard display interface circuit, the communicating interface circuit and the anti-interference circuit.Chapter four: Firstly, creatively puts forward the double circulation message drive programming idea, and detailedly expounds the basic theory of the double circulation message drive; Afterwards, works out the software of the electromagnetic flowmeter system according to it; Finally, works out the multi-byte decimal fixed point numbers multiplication & division subprogram, through studying the current arithmetic.Chapter five: mostly introduces the structure and functional module arranging of the intelligent electromagnetic flowmeter system, and gives the condition, process and result of system test.Chapter six: Firstly, introduces the development background, basic constitute and pivotal technology of the sewage monitoring network system; Afterwards, introduces how to apply the electromagnetic flowmeter to the sewage monitoring network system, and gives the communication protocol and regulation between electromagnetic flow--meter as a node equipment and PC in the control station.Chapter seven: summarizes the work of this dissertation and puts forward the future research work.