Sept,20232023年9月AUTOMATIONINPETRO-CHEMICALINDUSTRY石自动第59卷Vol.59,No.5油第5期化化宽量程比差压流量计的研究戴建刚"，沈创谦，纪波峰”，纪纲（1.江苏利电能源有限公司，江苏无锡214431；2.深圳烟草工业有限责任公司，广东深圳5181093.上海同欣自动化仪表有限公司，上海200070）摘要：标准差压流量计一般存在量程比不够宽的缺点，为弥补不足，采用更换孔板法、多套流量计测量法、多台差压式流量计切换使用法、数字通信传输法等方法来扩大量程比。讨论了量程过范围对差压变送器性能的影响和过范围试验方法，以及计量检定和流量测量准确度现场验证问题。分析表明，差压式流量计的安装方式也是保证测量准确度和量程比的重要环节，必须严格执行相应的规程，避免引起差压信号的传递失真，进而引起误差。关键词：差压式流量计；宽量程比；过范围影响；HART协议；量程自动切换；信号传递失真中图分类号：TH814文献标志码：B文章编号：1007-7324（2023)05-0096-05ResearchonDifferentialPressureFlowmeterWithWideRangeRatioDaiJiangang',ShenChuangqian’,JiBofeng",JiGang"(1.JiangsuLidianEnergyCo.Ltd.,Wuxi,214441,China;2.ShenzhenTobaccoIndustryCo.Ltd.,Shenzhen,518109,China;3.ShanghaiTontionAutomationInstrumentationCo.Ltd.,Shanghai,200070,China)Abstracts:Standarddifferentialpressureflowmetergenerallyhasthedisadvantageofnothavingawiderangeratio.Tomakeupthedisadvantage,avarietyofmethods,suchasreplacingorificeplatemethod,multipleflowmetermeasuringmethod,multipledifferentialpressureflowmeterswitching,digitalcommunicationtransmissionareappliedtoexpandtherangeratio.Theinfluenceofover-rangetoperformanceofthedifferentialpressuretransmitter,andover-rangetestmethod,andmeteringcalibrationandthequestionforon-siteverificationforflowmeasuringaccuracyarediscussed.Theanalysisresultindicatesthattheinstallationmodeofdifferentialpressureflowmeterisalsoanimportantlinktoensuremeasurementaccuracyandrangeratio.Correspondingregulationsmustbestrictlycompliedwithtoavoidtransmissiondistortionofdifferentialpressuresignals,andtoresultinsignificanterrorsfurther.Keywords:differentialpressureflowmeter;widerangeratio;over-rangeeffect;HARTprotocol;automaticrangeswitching;sign...
