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1、IntroductionofThermistorAlipChenMarch152011ConceptDefinition:Thermistor:thermallysensitiveresistorApplication:TemperatureDetector,Control,Switch,Fuse…Catalog:NTC,PTC,RTD,…NTC:NegativeTemperatureCoefficientResistorPTC:PositiveTemperatureCoefficientResistorRTD:ResistanceTemperatureDetectorRes
2、istanceTemperatureDetectorTypeElementMaterialBaseResistance(Ohms)TCR(Ohm/Ohm/C)BaseResistanceTolerance+/-TCRTolerance%CBCOPPER10OHMSAT25C.004270.2%1%CCCOPPER10OHMSAT25C.004270.5%1%NANICKEL120OHMSAT0C.006720.5%1%PAPLATINUM100OHMSAT0C.003850.06%0.12%PBPLATINUM100OHMSAT0C.003850.12%0.35%PCPLAT
3、INUM100OHMSAT0C.003850.5%1%PEPLATINUM100OHMSAT0C.003910.12%0.35%PFPLATINUM100OHMSAT0C.003910.5%1%PGPLATINUM100OHMSAT0C.003750.12%0.35%PHPLATINUM100OHMSAT0C.003920.5%0.1%Type:WireWound,ThinFilmMaterial:Pt,Cu,NiPrinciple:R-TeffectSample:seephotosTypicalperformance:SeebelowtableFeatures:accura
4、cy,linearResistanceTemperatureDetectorFeaturesRtdThermocoupleAccuracyMoreAccurateLessAccurateTemperatureRange-200to600ºC-200to2000ºCInitialCostMoreExpensiveLessExpensiveSensitivity1"Typical(otherlengthsavailable)PointSensingOnlyResponseTime1to7secondslessthan0.1secondRobustnessGoodGood,Subj
5、ecttodriftReferenceJunctionNotRequiredRequiredLongTermStabilityExcellentGood.SubjecttodriftOutputResistance 0.4ohm/ohm/ºC HighlyLinearVoltage 10-40microvolts/ºC, ApproximatelylinearElectricalNoise ResistanceLesssusceptibleMoresusceptibleResistanceTemperatureDetector(Rtd)vs.Thermocouples(Gen
6、eralPrinciples)ThermocoupleType:K,E,J,N,B,R,SMaterial:Pt–Rhodium,W-Rhenium,Constantan,CupronPrinciple:SeebeckeffectthatthejunctionbetweentwometalsgeneratesavoltagewhichisafunctionoftemperatureTypicalperformance:SeebelowtableFeatures:interchangeable,widerangeoftemperaturesThermocoupletypeOve
7、rallrange°CsensitivityB(Platinum/Rhodium)20to182010µV/°CE(Chromel/Constantan)-270to91068µV/°CJ(Iron/Constantan)-210to120050µV/°CK(Chromel/Alumel)-270to137041µV/°CN(Nicrosil/Nisil)-270to130010µV/°CR(Platinum/Rhodium)-50to176010µV/°CS(Platinum/Rhodium)-50t
