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1、附录CLiquidLevelMeasurementChemicalindustrywiththeprogressofscienceandtechnologygotrapiddevelopment,inordertomaketheequipmentsafeandreliableoperation,andcanbeutmosttoimproveproductquantityandquality,toeffectivelyoperateautomaticallyandprocessadjustment,realizethescientificmanagementfortheente
2、rprisetoprovidethenecessarymaterialandenergyofaccuratedata,mustbeinproductionintheprocessofpressure,flow,level,temperature,chemicalcompositionofvariousparameterssuchastimely,accuratemeasurement.Generallytheprocessofcontainers,tanks,towers,tankofliquidsurfacepositionlevel,slotbucket,cans,and
3、warehouseChuFasolidblock,theaccumulationofparticles,powderheightandsurfacepositioniscalledamateriallevel;Twonotfluidboundarybetweentheheightandtheliquidandsolidseparationheightiscalledinterfaceposition,thepositionofassemblylevel,materiallevel,liquidlevelinterface.Materiallevelmeasurementtoc
4、orrectlymeasurethecontainerstoragecapacityorquality,knowcontainerlevelofhighandlowandadjustatanytime,inthematerialleveltomaintaintherequiredheight.Materiallevelmeasurementinchemicalprocess,notonlyundernormaltemperature,atmosphericpressureandordinarymedium,materiallevel,liquidlevelmeasuremen
5、toftheinterface,butalsooftenmeethightemperature,lowtemperature,highpressure,inflammableandexplosive(negativetemperature).Viscosityandfoam,boilingdielectricmateriallevelmeasurementproblems.Inordertoadapttothecharacteristicsofchemicalobjects,tomeettherequirementsofthechemicalprocessmaterialle
6、velmeasurement,therearemanymateriallevelmeasurementandinstrumentation.1.Ultrasonicliquidlevelmeterandradarmateriallevelmeter(1)ultrasonicliquidlevelmeterMateriallevelmeasurementprocess,theultrasonicsignal,issuedbytheultrasonicprobe,theliquidorsolidmaterialsurfaceafterlaunchback,bythesamesen
7、sorreceiving,ultrasonicmeasurementofthewholerunningtime,soastorealizethemeasurementofmateriallevel,-12-acousticvelocitytransmissionoftheultrasonicpulse,fromtransmittingtoreceivingtoultrasonicpulseneedtimeintervalandthetransducertothesurfaceofthemeasuredm
