基于PLC的压力表检定系统

以微机及PLC等为硬件,利用现代组态软件为软件操作环境,设计了压力表自动检定系统.系统根据国家相关规程的要求,由微机控制造压和升压,检定人员通过微机随意设定压力检测点及各种参数值,系统通过PLC收集压力表及标准压力表的示值,同时可以检定多块压力表.微机自动计算示值误差、回程误差和轻敲位移等,与预存的一览表数据进行比较,自动判断压力表是否合格,可以打印检定证书.系统实现了压力表全程检定自动化.

Verification System for Pressure Gauge Based on PLC

The automatic calibration system for the pressure gauge is designed with the microcomputer and PLC as hardware, and the modern configuration software as the software operating environment. According to the related requirements, it is the computer that controls to produce pressure and reduce pressure. The verifiers set the pressure points for calibration and all kinds of parameters by computer at random. PLC collects the data from the pressure gauge and the standard pressure gauge which helps the verifiers inspect different pressure gauges at the same time. The computer can calculate the errors of the displayed value, hysterisis error and tapping displacement etc., and compare with the data listed in computer to make the judgement automatically wheter the pressure gauge is qualified or not. What＇s more, it can print calibration certificate automatically. This system achieved the automatic calibration for the pressure gauge.