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Study on Tightness and Networked Port Technology for Capacitive Pressure Transmitter

Author: LiJingTao
Tutor: LiuGuiXiong；LuoXiaoYong
School: South China University of Technology
Course: Mechanical Engineering
Keywords: Pressure Transmitter Capacitive Sensor Package Technology Networked
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 8
Quote: 0
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Abstract


The capacitive pressure transmitter is a king of spot meter which has mature technology and wide range of application, the sealing performance is the main factor that influence it’s comprehensive performance. An important developing direction of capacitive pressure transmitter is intelligent, networked. The thesis makes sealing technology and networked port technology for pressure transmitter included in the research topic, which has important academic value and practical significance to promote the sensing technology.The thesis introduces the background and research significance of the subject, introduces the research progress of related content from the sealing and networked technology port in the sensor field, get the main content of the thesis needs to research. The thesis mainly focuses on how to improve the sealing performance of capacitive pressure transmitter, optimize the application of networked port technology in capacitive pressure transmitter to launch the research.The main work of the thesis includes:①Researches the sealing defects and key technology of capacitive pressure sensor.Though the principle and special structure of metal diaphragm capacitive sensor, getting the main defects and factors of the sealing technology, launching the research from the aspects such as welding materials, welding equipment, welding technology.②Researches the solutions for the sealing defects of capacitive pressure sensor. Puts forward the solutions for the welding materials of center diaphragm and isolated diaphragm, develop the welding materials’performance by formulating chemical inspection standards, aging heat treatment, new material test. Puts forward the solutions for the welding equipment, greatly reduces the adverse impact to welding sealing performance brought by the mechanical equipment defects by improving hydraulic pressure, adjusting the concentricity of welding jig, improving the structure of center diaphragm tensioning device and oil filled machine. Puts forward the solutions for welding technology, develop the welding sealing performance.③Analyzes and summarizes the research results for sealing technology, checks the effectiveness of various solutions. Analyzes and rules out the cross influence of the factors, ensure the research method of the thesis is right.④Researches the application of networked port technology in capacitive pressure transmitter. Through testing the standard intelligent board, concludes that the existing compatibility problems, independently develop intelligent board. Designs the meter header structure of intelligent board by Pro/Engineer software. Embeds HART into the hardware and software development of intelligent pressure transmitter.The results of this thesis shows that the research in sealing and networked port technology of the thesis and the jobs in welding materials, welding technology, welding equipment, intelligent pressure transmitter are effective, the results are right.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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