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1、附录CLiquidLevelMeasurementChemicalindustrywiththeprogressofscienceandtechnologygotrapiddevelopment,inordertomaketheequipmentsafeandreliableoperation,andcanbeutmosttoimproveproductquantityandquality,toeffectivelyoperateautomaticallyandprocessadjustment,real
2、izethescientificmanagementfortheenterprisetoprovidethenecessarymaterialandenergyofaccuratedata,mustbeinproductionintheprocessofpressure,flow,level,temperature,chemicalcompositionofvariousparameterssuchastimely,accuratemeasurement.Generallytheprocessofcont
3、ainers,tanks,towers,tankofliquidsurfacepositionlevel,slotbucket,cans,andwarehouseChuFasolidblock,theaccumulationofparticles,powderheightandsurfacepositioniscalledamateriallevel;Twonotfluidboundarybetweentheheightandtheliquidandsolidseparationheightiscalle
4、dinterfaceposition,thepositionofassemblylevel,materiallevel,liquidlevelinterface.Materiallevelmeasurementtocorrectlymeasurethecontainerstoragecapacityorquality,knowcontainerlevelofhighandlowandadjustatanytime,inthematerialleveltomaintaintherequiredheight.
5、Materiallevelmeasurementinchemicalprocess,notonlyundernormaltemperature,atmosphericpressureandordinarymedium,materiallevel,liquidlevelmeasurementoftheinterface,butalsooftenmeethightemperature,lowtemperature,highpressure,inflammableandexplosive(negativetem
6、perature).Viscosityandfoam,boilingdielectricmateriallevelmeasurementproblems.Inordertoadapttothecharacteristicsofchemicalobjects,tomeettherequirementsofthechemicalprocessmateriallevelmeasurement,therearemanymateriallevelmeasurementandinstrumentation.1.Ult
7、rasonicliquidlevelmeterandradarmateriallevelmeter(1)ultrasonicliquidlevelmeterMateriallevelmeasurementprocess,theultrasonicsignal,issuedbytheultrasonicprobe,theliquidorsolidmaterialsurfaceafterlaunchback,bythesamesensorreceiving,ultrasonicmeasurementofthe
8、wholerunningtime,soastorealizethemeasurementofmateriallevel,-12-acousticvelocitytransmissionoftheultrasonicpulse,fromtransmittingtoreceivingtoultrasonicpulseneedtimeintervalandthetransducertothesurfaceofthemeasuredm
