临界流文丘里喷嘴法气体流量标准装置期间核查方法研究  

Research on Intermediate Check Method for Gas Flow Standard Devices Using Critical Flow Venturi Nozzles

作　　者：王雪丽 赵作广 徐焰栋 徐昭 WANG Xueli;ZHAO Zuoguang;XU Yandong;XU Zhao(Calibration and Testing Center For Gas Flowmeter of the Quality and Technology Supervision Bureau of Jiangsu,Zhenjiang 212132,China)

机构地区：[1]江苏省质量技术监督气体流量计量检测中心,镇江212132

出　　处：《计量科学与技术》2023年第1期68-72,共5页Metrology Science and Technology

摘　　要：期间核查是实验室量值溯源计划体系的重要部分。常用的临界流文丘里喷嘴法气体流量标准装置的期间核查方法是En值判定法,但该方法对核查标准的长期稳定性依赖性很大,容易产生误判。设计了一种装置内喷嘴(组)比对核查与实验室内多套装置比对核查相结合的方法,并以一套临界流文丘里喷嘴法气体流量标准装置为例,进行了核查方法设计和试验数据分析。该方法不但能对装置中各主要计量器具进行全面核查,还能随时对实验室内多套同类装置进行核查,减少核查标准由于安装以及使用环境变化造成的测量偏差,使得临界流文丘里喷嘴法气体流量标准装置的期间核查工作更加便捷、可靠。Intermediate check plays a critical role in the value traceability system of a measuring laboratory. The Judgement Method of Envalue is a common method used for intermediate checks of gas flow standard devices. However,this method heavily relies on the long-term stability of the check standard, which can lead to erroneous judgments. To address this issue, we designed a new method that combines two comparative tests. The first test compares the critical flow venturi nozzles within the device, and the second test compares several devices within the laboratory based on the same measurement principle. This article provides a description of the procedures involved in the intermediate check method, and we analyze the test data using an example. Our method can fully monitor the reliability of the device’s main standards, as well as check the reliability of several intralaboratory devices at any time. Furthermore, our approach reduces the measurement error caused by changes in installation and operating environments. In summary, this intermediate check method is more convenient and efficient, making the verification process for critical flow venturi nozzles in gas flow standard devices more reliable.

关 键 词：临界流文丘里喷嘴法 气体流量标准装置 期间核查 核查标准 质量监控 

分 类 号：TH814[机械工程—仪器科学与技术]