现场服务型标准表法气体流量标准装置的研制

Development of Field Service Gas Flow Standard Device with Master Meter Method

针对目前气体流量计检测送检时间长,实验室检测工况与流量计实际使用工况不同造成误差扩大等问题,设计了移动式、单元化的现场服务型标准表法气体流量标准装置;介绍了该装置的工作原理,装置硬件的选型以及结构;工控机通过Modbus控制变频器与风机形成稳定的负压源,并通过电流与频率采集模块采集标准表,被检表及相应温度压力传感器的数据;软件通过虚拟仪器技术使用LabWindows/CVI设计了简单易用的程序;通过分析装置的不确定度,稳定性及进行传递比较法的验证,证实了这种现场服务型标准表法气体流量标准装置可应用于现场的气体流量计的检定;节省了送检时间,提高了企业设备使用效率。

Aiming at the problem of long inspection time of gas flowmeter,and the error caused by difference of laboratory inspection conditions and actual use conditions.A mobile and modular master meter gas flow standard device is designed.The working principle,selection and structure of device hardwareare introduced.The industrial computer controls the frequency converter and fan to form a stable negative pressure source through Modbus,and collects the data of master meter,tested flowmeter and corresponding temperature and pressure sensor through current and frequency acquisition module.The software uses LabWindows/CVI to design a simple and easy-to-use program.Through the analysis of the uncertainty,stabilityand transfer comparison method of the device,it is confirmed that the field service master meter method gas flow standard device can be applied to the verification of the field gas flowmeter.The inspection time is saved,the use efficiency of enterprise equipment is improved.