Intelligent Heat Meters Based On Ultrasonic Study

The main topic is to address the situation and heating at home and abroad to respond positively to the latest national policy reform on the centralized heating requirements of a new vortex based on ultrasonic heat meter in depth study.As a smart ultrasonic vortex meter heat meter, it is not only able to complete high-precision measurement of temperature and flow, but also able to complete the calculation of heat flow and display requirements, and this flow also supports the HART bus communication, but it also With fault diagnosis and store the data from these two functions. The new scale also used ultrasonic heat vortex signal detection method, It uses a PIC18F8490 micro-processor as the core chip used in the measurement method combined with fuzzy reasoning principle-based tracking narrow-band filter measurements;We measure the temperature sensors Pt1000 used high-precision platinum resistance;as Zhineng instrument of communication is the use of its way to achieve HART bus, and its friendly LCD display and the unique one-button setup method appears this instrument is more intelligent and humane. Software design includes the following main aspects:the overall structure of software system design, the processing speed, LCD process, test the temperature of the process and debug serial communication protocol and a number of procedures; on the hardware circuit design includes a signal and temperature, and vortex signal detection circuit and some basic communication circuits. This new type of heat meters will not only joined the HART bus communication functions, but also data measurement, calculation and display functions integrated in a transmitter, so that it benefits low power consumption, good reliability, accuracy is more obvious another job.In the article on HART protocol in-depth analysis, in order to complete the preparation of test hardware and software design and PC software to enable communication, and fuzzy inference method used in the detection of flow experimental study, The measured data obtained from analysis of the use of expert systems, and there are strict output control, so that the general distortion meter readings to be completely resolved, and finally the simulation study to confirm the correctness of the theory. In addition, in the article by commissioning experimental prototype, confirmed the good of the table with micro-power consumption, particularly good and stable performance, high precision and reliability is superior, friendly interface and self-diagnostic capabilities and the ability to adapt advantage. In this design, the use of HART bus communication technology makes a more intelligent instrument, the fuzzy reasoning applied to the data processing, data processing can be more complex simplicity, so that you can solve the distortion of the flow meter readings, This can be very good to improve the reliability of the instrument.