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Vortex flowmeter with a large -scale range , high reliability, long life, small pressure loss , has been widely used in various fields . With the development of microelectronics technology , information processing technology and digital communication technologies , vortex flowmeters are from traditional modular instrument to the direction of the integration of intelligent instrumentation development, combined with fieldbus technology site bus meters . Fieldbus technology for industrial measurement and control system networks , digitization , all field devices hanging on the bus , which has a two-way communication capabilities . HART protocol is a transitional fieldbus standard , applicable to the smart field instruments and control room equipment communication a standard communication protocol for digital communications , analog signal transmission line . The MSP430F5438 microcontroller uses a low-power design of an integrated , intelligent vortex flowmeter and HART communication part of the combined flow measurement , pressure , temperature measurement , display , communication and other functions . The system design uses a low-power components , thereby reducing the power consumption of the entire system , so that the system can use the two-wire power supply . To the noise analyzed by the characteristics of the signal and noise , the signal processing method , using the FFT of the periodogram of the signal spectrum estimation, the system is improved filtering performance . Studied in a variety of media under the conditions of temperature and pressure compensation method , the Vortex compensation model , and applied to the vortex flowmeter , and achieved good results . Combined with the actual requirements , vortex flowmeter signal processing circuit design , human-machine interface circuit , microcontroller circuit , HART communication circuit and the corresponding part of the program . Finally, to test the communication and the flow of the system , to verify the accuracy and reliability of the system .
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