TI212FEN

TechnicalInformationTI212F/00/enUltrasonicLevelMeasurementprosonicPFMU801ControlofseveraldistributedmeasuringpointsMeasuredvaluedisplayonpersonalcomputerSensorssuitableforuseinhazardousareasFeaturesandBenefits•Economicalinstallation,becausefewercablesmustbelaid•Fastresponse,becausetheprocessiscontrolledlocally,directfromthetrans-mitter-nodelaysduetoscanningofmeasuringpointsortransmissionofdata•SimpleleveldisplayusingprovenDOSandWindowssoftware•Guaranteedprecision,evenwhenthetemperaturechanges•Doubleprotectionagainstoverspillthankstooptionalexternallimitswitch•Easy,economicalexpansionwithRackbusRS-485orPROFIBUS-DPinstrumentationApplicationTheProsonicPultrasoniclevelmeasur-ingsystemallowsparametersfromupto25distributedmeasuringpointstobeconfiguredanddisplayedonapersonalcomputer.TheeconomicalpackageisbasedontheProsonicFMU867transmitterandtheultrasonicsensorsFDU80...86,whicharealsosuitableforuseinexplosionhaz-ardousareasorwithcombustibledusts.Datafromthemeasuringpointsaretrans-mittedtothepersonalcomputerviatheRackbusRS-485oprPROFIBUS-DP.ThevaluesaredisplayedbytheCommu-graphorCommuwinIIsoftware.Endress+HauserFMU867ProsonicPFMU8012Endress+HauserMeasurementPrincipleUltrasonicLevelMeasurementTheultrasonicprinciplereliesonthemeasurementofthetimeelapsingbetweentheoutputofaninitialpulseandthereceptionofitsechofromtheproductsurface.•Themeasurementisindependentofproductpropertiessuchasspecificgravity,conductivity,viscosity,anddielectricconstant.•Themeasurementprecisionisunaffectedbychangesinambienttemperaturewithinthesiloortank:theProsoniccompensatesbyusingthetemperatureinformationdeliveredbythesensor.•Dependingonthesensor,themeasuringrangeisupto70minsolids.ResolutionBPROSONICFMU867ProsonicFMU867SensorFDU…B:blockingdistanceD:distancesensor-productsurfaL:levelRange[m]33...66...1212...3030...4545...70Resolution[mm]124102030ProsonicPFMU801Endress+Hauser3SignalProcessingTheProsonictransmitterisequippedwithevaluationalgorithmsinwhichfuzzylogicelementsarealsoused.Withoutspecialconfiguration,thetruelevelsignalisreliablydistinguishedfrom:•sporadicechoes(e.g.fromagitatorblades)•noise(e.g.duringfilling)or•multiplereflections(e.g.fromfine-grainedsolidsorinclosedtanks).Evenwhenthepositionofthesensorisfarfromideal,reliablemeasurementscanstillbeachievedsincethefixedtargetsuppressionmodeorafilterfactorcanbecalledupon.SimpleCommissioningCommissioningtimeissubstantiallyreducedbytheuseofpre-setconfigurationsforparticularapplications.Byenteringasingleparameterthemeasuringsystemissetautomaticallytomeas-ure:•liquids•productswithrapidlychanginglevels•fine-grainedbulksolids•coarse-grainedbulksolids•conveyerbeltsInadditiontothestandardoperatingmodeswithonesensor,theProsonicFMU867alsooffersanaveragelevelmeasurementwithtwo.ProsonicPFMU8014Endress+HauserEquipmentarchitectureSystemComponentsThemeasuringsystemcomprisesseveraltransmittersProsonicFMU867.OneortwosensorsFDU80...86maybeoperatedoneachtransmitter.Forspecialapplicationsfurtherinstrumentsmaybeconnectedtoeachmeasuringpoint:•separatetemperaturesensor•separatelimitswitchForparametrizationandvisualizationthetransmittersareconnectedtoaPersonalComputerviaRS485orPROFIBUS-DP.RS485Dependingonsystemarchitectureupto50measuringpointsmaybeconnectedtothebus.Themaximumbuslengthis1200m.PROFIBUS-DPUpto126transmittersmaybeconnectedtoeachPROFIBUS-DPbus.Themaximumbuslengthdependsonthetransmissionrate:InterfacestoaPersonalComputerRS485•forthegraphicaloperatingprogramCommuwinII:–CommuboxFXA192–InterfacesFXA675andZA672PROFIBUS-DP•PROFICARD(PCMCIAcard)•PROFIBOARD(PCIBoard)transmissionrate(kbit/s)19,2-93,75187,55001500max.cablelength(m)12001000400200ProsonicFMU867transmitterwithoneortwosensorsPersonalcomputerwithFieldmanager,Commugraph,CommuwinorToFToolRS485orPROFIBUS-DPFXA675(ZA6675)ZA672ProsonicPFMU801Endress+Hauser5Volume/WeightMeasure-mentVolumeorweightiscalculatedfromlevelbymeansofavesselcharacteristicwhichdescribestheirfunctionalrelationship.Themostcommoncharacteristic,ahorizontalcylinder,ispro-grammedasastandardfeature.AnalogueOutputsTheProsonicFMU867transmitterprovidesastandard0/4...20mAsignalateachofitstwochan-nels.Dependinguponconfiguration,theseareproportionaltoeitherlevelorvolume(weight).Thestartandendofthesignalrangecanbeprogrammedasrequired.PROFIBUS-DPoutputUptothreecyclicdatacanbetransmittedbythePROFIBUS-DPinterface:•Mainvalueofchannel1(Level/Volume)•Mainvalueofchannel2(Level/Volume)•FlowcounterRelaysThetransmitterisequippedwiththreerelayswhichcanbeindividuallyprogrammedas:•levellimitrelays,minimumormaximumfail-safemodeasrequired,withalternationandtimedelayforpumporfeedcontrolapplications.•trendrelays,switchingwhenthefillingoremptyingrateexceedsthesetvalue•analarmrelay,switchingwhenaninstrumentfaultisdetected.FunctionMonitoringTheProsoniccontinuouslymonitorsallsignallinesfromthesensortotheanalogueoutputs.Ondetectionofafault:•allLEDsflash•theanaloguesignalsswitchto–10%,+110%orholdthelastvalue•limitrelaysrespondaccordingtothefail-safemodeselected•analarmrelayde-energises•theappropriatestateistran