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...