超声波燃气表燃气和空气关系研讨  

Study on the Relationship Between Gas and Air Through Ultrasonic Gas Meters

作　　者：赵作广 徐焰栋 李志 傅杰 ZHAO Zuoguang;XU Yandong;LI Zhi;FU Jie(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》2022年第1期60-64,共5页Metrology Science and Technology

摘　　要：超声波燃气表从理论上分析其计量性能与介质无关。但是燃气和空气,由于声阻抗不同,引起声波在两种介质中的透射率不同;由于切变黏滞系数和摩尔质量不同,声波衰减程度不同。采用流量范围为0.016~10 m;/h,最大工作压力为10 kPa,扩展不确定度U;=0.33%(k=2)的活塞式流量标准装置对3个1.5级G4规格超声波燃气表进行燃气测试。数据表明,1#出现零漂,导致其大中流量点误差比空气偏-5.61%,3#出现错波及零漂现象,导致其小流量点误差比空气偏-15.22%。由此建议在型式评价时将燃气和空气关系作为必测项目。The measurement performance of ultrasonic gas meters is, theoretically, independent of the object(i.e. the medium) they measure. However, due to the different acoustic impedances of gas and air, the transmittance of sound waves in the two media is different;due to the difference in shear viscosity and molar mass, the attenuation of sound waves is different. A standard piston-type flow device, with a flow range of(0.016~10) m;/h, the maximum working pressure of 10 kPa and expanded uncertainty of U;=0.33%(k=2), was used to test three 1.5-level G4 ultrasonic gas meters. The test data showed that 1# had zero drift, which caused its large and medium flow point error to be-5.61% compared to air, and 3# had a wrong-wave and zero-drift phenomenon, which caused its small flow point to have an error of-15.22% compared to air.Therefore, it is recommended that the relationship between gas and air be a mandatory item in type evaluation.

关 键 词：超声波燃气表 燃气和空气关系 最大平均误差偏移 最大平均误差幅度 活塞式流量标准装置 

分 类 号：TU996.7[建筑科学—供热、供燃气、通风及空调工程]