The Realization And Experimental Study Of The Pressure Data Acquisition System

The traditional methods of calibration of pressure instruments typically use piston gauge. The pressure automatic verification system based on piston, on the principle of its construction defect, makes its standard output pressure value can only be discrete, which caused a considerable extent not convenient. Piston gauge operation is very complex. The technical capabilities and labor intensity of the operators are higher. The test efficiency is very low.The pressure data acquisition system is a key component of the automatic pressure calibration system, as an external digital pressure module, providing a standard pressure signal for automatic system.. The pressure data acquisition system is a key component of the automatic pressure calibration system, as an external digital pressure module, providing a standard pressure signal for automatic system. The pressure signal can be directly converted to the characteristics of the micro-voltage signal by pressure sensor.Taking advantage of the control chips, it achieves the function that collects and feds continuous, high-precision pressure signal automatically. Making use of the pressure data acquisition system, automatic system can use the pressure value to complete P.I.D algorithm to create pressure of any setting point, and to avoid the output pressure points discontinuous defects.The system uses MSP430F149microprocessor as the core, using imports of titanium-the silicon sapphire pressure sensor and independent24-bit A/D converter to collect and convert pressure signal. The data is processed by nonlinear, temperature compensation and filtering. The system takes advantage of RS-485to constitute the bus-type communication network. This system will serve as external digital pressure modules for the automatic pressure calibrator system, providing the standard pressure signal to it to ensure that it can complete the P.I.D computing based on the pressure value returned, so that the automatic pressure calibrator system can occur the pressure automatically.The circuit structure of the pressure data acquisition system is simple, reliable, and the system has completed the online test with the automatic pressure calibrator system. The pressure data acquisition system reached the performance requirements and has been accredited by the China National Institute of Metrology. The accuracy of the pressure data acquisition system can be0.05%or more, and can be able to meet the project’s needs well. Using visual studio C#to developed a fast calibration system that based on the Win32platform for the pressure data acquisition system. This article will focus on the actual use of the pressure data acquisition system in the automatic pressure calibrator system, and the pressure data acquisition system’s principle of hardware and software design, and will give the block diagram of the system, the diagram of major circuit, as well as the block diagram program.