Research And Design On A Multi-variable Smart Transmitter

Flux is a kind of important measuring parameter in the fields of aerospace,environmental protection, energy measurement, industrial production. As technology of allfields advances, requirements on flux measuring are getting higher, as a result of which,demand of instruments that have both functions of multi-variable acquisition and real-timedata processing is looms large. However, the present flow meters are still composed ofmultiple single variable instruments, because of which, it’s difficult to meet therequirements on the flux measurement. To fill these holes, a new flow meter named ofmulti-variable smart transmitter is proposed. The transmitter can measure temperature,pressure and differential pressure at a point in the pipe at the same time and complete dataprocessing in real time. In addition, the multi-variable smart transmitter can complete faultdiagnosis and data restoration automatically, and communicate with upper computer infield-bus in real time, and is able to receive signals from various throttle devices andtemperature sensors. In comparison to traditional flux instruments, the multi-variabletransmitter is smarter.The whole system with a micro single chip as the core to collect signals frommultiple channels and complete data processing in real time is composed of twocomponents named of hardware and software. The hardware part includes the prepositivemeasuring circuit, the signal conditioning circuit, the AD transmitting circuit, thesingle-chip microcomputer minimum system and the circuits controlled by the microchip.There are six keys in the keyboard. The design of multiple keys makes users learn tooperate simply and reduces the probability of misoperation. The software part includes theinitialization module, the data collection module, the data processing module, the displaymodule, the digital filtering module and the communication module. To improve thereliability, the designer layout the printed circuit board in strict accordance with relatedprinciple and combine hardware and software together. Thus, the anti-interferenceperformance is improved remarkably, and the power consumption is lower than traditionalflux meters.