As a high-precision liquid level measuring device, magnetostrictive liquid level gauge needs to ensure the reliability and accuracy of its calibration. In this paper, a precise measurement platform of liquid level gauge with precision grating ruler as measurement standard is designed. The device uses servo motor to drive the workbench to move along the vertical axis. The actual displacement value of the workbench and the output value of the liquid level gauge are analyzed and processed by computer to realize the calibration of the liquid level gauge. By analyzing the error source of the device, the measurement uncertainty of the device is determined. Based on the principle of inverse compensation method, the systematic error is separated from the error curve and superimposed with its inverse curve to eliminate the influence of systematic error. After compensation, the positioning error increases from 52 μ M improved to 6 μ m。 Theoretical analysis and experimental results show that the designed device can meet the calibration requirements of 0-2m float level gauge.
With the gradual promotion of Microsoft.NET platform, C# as an object-oriented programming language based on the platform has been widely used. Therefore, more attention is concentrated on how to achieve the communication between Panasonic PLC and PC efficiently and fast in C#.NET environment. In this paper, a method of using SerialPort control which could be used for achieving communication between PLC and PC is introduced. Meanwhile, the reason of abnormal thread when displayed the receiving data in form is analyzed and the programming method to solve the problem of thread safety is designed. Achieving the communication of Panasonic PLC and PC in C#.NET environment can give full play to the advantages of the .NET framework. It is practical, easy communication, high reliability and can combine with other measurement and calibration procedures effectively and conveniently. Configuration software is expensive and can only communicate with PLC separately, but these shortcomings can be solved in C#.NET environment. A well-designed user interface realized real-time monitoring of PLC parameters and achieved management and control integration. The experiment show that this method of data transfer is accurate and the program’ running is stable.
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