Design of Control System of Water Flow Calibration Facility
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摘要: 介绍了一种采用称重法标定标准表、标准表法标定被测流量计的水流量标准装置的组成,重点阐述了该装置控制系统的硬件组成、工作原理及人机界面设计方案。该控制系统采用S7-300 PLC对水流量标准装置的数据进行采集及处理,控制水泵启停、换向器换向,并采用SIMATIC WinCC组态软件实现水流量标定效果显示、参数设置及报表的生成、保存、查询等功能。测试结果表明,该水流量标准装置标定出的涡街流量计的线性度和重复性达1.0级精度要求,其控制系统稳定可靠,不确定度小。Abstract: The paper introduced composition of a water flow calibration facility which uses weighing method to calibrate standard meters and standard meter method to calibrate measured meters and expounded hardware composition, working principle and design scheme of human-machine interface of control system of the facility. The control system uses S7-300 PLC to collect and process data of the facility and control water-pumps and direction changer, and uses SIMATIC WinCC to realize functions of display of water flow calibration result, parameter setting, form generation, form storage and form inquiry. The testing result showed that both linelikeness and repeatability of vortex flow meter calibrated by the facility achieve precision of 1.0 level and the control system is stable and reliable with little uncertainty.
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