全自动气体活塞式压力计控制系统开发

Development of Automatic Gas Piston Manometer Control System

摘要: 活塞式压力计是目前唯一能在宽量程范围内溯源至SI基本单位的压力计量仪器。目前大多数活塞式压力计采用液压油作为工作介质，通过手动的方式进行加压和加码。液体式存在种种弊端：粘稠度受温度变化大、准确精度低、压力输出稳定性差、容易产生泄漏等。气体活塞压力计可对压力表的表压、绝压、真空压力等进行测量和校准，气体灵敏度高、流动性能强、摩擦产生阻力小、误差值小、检测数据准确可靠。国内气体活塞式压力计研究较少，为了解决这种问题并适应市场需求，设计一款使用气体作为工作介质的全自动气体活塞式压力计，通过对硬件电路的设计和软件程序的编写，本文设计的全自动气体活塞式压力计控制系统可以实现高压气体在0~6 MPa的任意气体压力的输出。最后通过与同规格液体活塞式压力计进行压力输出稳定性对比，验证了该气体压力计设计的有效性。

Abstract: Piston pressure gauges are currently the only pressure measuring instruments that are traceable to SI base units over a wide range. At present, most piston pressure gauges use hydraulic oil as the working medium, and pressurize and add code manually. The liquid type has various disadvantages: the viscosity is greatly affected by temperature changes, the accuracy is low, the pressure output stability is poor, and it is easy to leak. The gas piston pressure gauge can measure and calibrate the gauge pressure, absolute pressure, vacuum pressure, etc. of the pressure gauge. It has high gas sensitivity, strong flow performance, small frictional resistance, small error value, and accurate and reliable detection data. There are few domestic gas piston pressure gauges. In order to solve this problem and meet the market demand, a fully automatic gas piston pressure gauge using gas as the working medium is designed. Through the design of the hardware circuit and the writing of the software program, the fully automatic gas piston pressure gauge control system designed in this paper can realize the output of any gas pressure of high-pressure gas at 0 ~ 6 MPa. Finally, the validity of the design of the gas pressure gauge is verified by comparing the stability of the pressure output with the liquid piston pressure gauge of the same specification.