本文提出了一种并联标准表法气体流量标准装置,采用4台罗茨流量计作为标准表,开发了基于虚拟仪器和PLC的测控系统,实现了各种气体流量计的快速、准确检定或校准。一、标准装置整体构成本文提出的并联式标准法气体流量装置以罗茨流量计为标准表,具有压损小、重复性好、量程比宽等优点。系统采用虚拟仪器开发人机界面并进行数据处理,采用VIPA系列高速PLC实现被检表和标准表的信号采集、阀门控制、风机调节等功能。装置原理如图1 This paper presents a parallel standard meter gas flow standard device, the use of four Roots flowmeter as a standard table, the development of a virtual instrument and PLC-based measurement and control system to achieve a variety of gas flow meter rapid and accurate calibration or calibration . A standard device overall composition This proposed parallel standard gas flow device to Roots flow meter as a standard table, with a small pressure loss, good repeatability, wide range of advantages. The system uses the virtual instrument to develop the man-machine interface and carries on the data processing. The VIPA series high-speed PLC is used to realize the functions of signal acquisition, valve control and fan adjustment of the seized meters and standard meters. Device principle shown in Figure 1