Dissertation
Dissertation > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Thermal measuring instruments > Temperature measuring instruments

Research on Automatic Field Calibration of Precision Thermometer for Process Industry

Author LiuDingQiang
Tutor LiuGuiXiongï¼›ChenMingHua
School South China University of Technology
Course Mechanical Engineering
Keywords Industrial Measurement Process industry Field Calibration Precision Thermometer Automatic Calibration
CLC TH811
Type Master's thesis
Year 2011
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Measurement data of industrial process is important information of the process of state sources. The important information comes from field measuring device measurements. Industrial process measurement devices inevitably produce actual measurement data error or even deviate from the allowable range. Therefore, calibration of measurement devices for industrial field studies and performance of measurement devices in a controlled range of industrial process optimization process have become one of the key technologies. To study the measurement performance of industrial field devices is to test the devices by reference standard and obtain data, and then process the raw data scientifically. These measurement data to optimize plant performance evaluate the reliability of measurement devices. Try to eliminate systematic errors and reduce the random error of measurement results, so as to improve the measurement performance of plant.This is a sub-project of the project "Research and application of industrial measurement process for small and medium enterprises" owned by The Science and Technology Department of Guangdong Province. The paper focuses on the following aspects: (1) The study about advanced, complex performance problems of measurement devices on industrial-site; (2) The study on industrial-site precision temperature measuring devices commonly used self-calibration method and its self-calibration method parameters quickly and accurately strike; (3) The methods of high-efficiency calibration of integrated measurement device; (4) Design a temperature measured device with communication interface and automatic calibration.This article shows the design of an field temperature calibration system. The lower computer hardware is based on core Atmegal128 AVR microcontroller. Analyze the baseline of our temperature measurement and use resistance ratio to measurement the value of resistance. Design a constant current source which can automatically change. Analyze and design of the hardware design of the anti-interference measures. This system integrate LCD module, show visual information for user during the development and debugging. Systematic software design is divided into two parts, the PC program and lower machine program. The PC program is based on Visual Studio.NET design. This article develops a fully automatic calibration system. In Excel, one of the main document to complete the standard temperature acquisition device and another document is used to collect data from equipment which is calibrated, and the original data. As the AVR compiler support C compiler, lower computer system software use C language. The entire temperature measurement system is under the control of the main program. The design and production of system for industrial field precision thermometer automatic calibration system is tested. Also we get some test data, and these data are analyzed.The results showed that the trial process and outcome of experiment are consistent with systematic design and use-goal.

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