摘要:述了制约节流式差压流量计范围度扩大的3个主要因素:差压测量精确度、流出系数的非线性和可膨胀性系数变化,分析了均速管流量计的范围度,最后讨论了拓展范围度和提高系统精确度的方法。关键词差压流量计均速管范围度不确定度自动校正Abshvct Threeo fth e二factorsw hichre strictex pansiono fth era ngeabilityo fth rottlety ped iferentialpr essurefl owmetesa red escribed.Th esein -eludes measuring accuracy of diferential pressure; non-linearity of flow-out coeficient; and variation of coeficient of expandability. The rangeability ofAnnubar flowmeter is analyzed, and the methods of expanding rangeability and enhancing systematic accuracy are discussed.Keywords Diferentialpre ssure flowmeter Ammbar Rangeability Undete-ninedness Auto-corection
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