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TECHNICALDATAMQ-135GASSENSORFEATURESWidedetectingscopeFastresponseandHighsensitivityStableandlonglifeSimpledrivecircuitAPPLICATIONTheyareusedinairqualitycontrolequipmentsforbuildings/offices,aresuitablefordetectingofNH3,NOx,alcohol,Benzene,smoke,CO2,etc.SPECIFICATIONSA.StandardworkconditionSymbolParameternameTechnicalconditionRemarksVcCircuitvoltage5V±0.1ACORDCVHHeatingvoltage5V±0.1ACORDCRLLoadresistancecanadjustRHHeaterresistance33Ω±5%RoomTemPHHeatingconsumptionlessthan800mwB.EnvironmentconditionSymbolParameternameTechnicalconditionRemarksTaoUsingTem-10-45TasStorageTem-20-70RHRelatedhumiditylessthan95%RhO2Oxygenconcentration21%(standardcondition)Oxygenconcentrationcanaffectsensitivityminimumvalueisover2%C.SensitivitycharacteristicSymbolParameternameTechnicalparameterRamark2RsSensingResistance30KΩ-200KΩ(100ppmNH3)α(200/50)NH3ConcentrationSloperate≤0.65StandardDetectingConditionTemp:20±2Vc:5V±0.1Humidity:65%±5%Vh:5V±0.1PreheattimeOver24hourDetectingconcentrationscope10ppm-300ppmNH310ppm-1000ppmBenzene10ppm-300ppmAlcoholD.Structureandconfiguration,basicmeasuringcircuitStructureandconfigurationofMQ-135gassensorisshownasFig.1(ConfigurationAorB),sensorcomposedbymicroAL2O3ceramictube,TinDioxide(SnO2)sensitivelayer,measuringelectrodeandheaterarefixedintoacrustmadebyplasticandstainlesssteelnet.TheheaterprovidesnecessaryworkconditionsforworkofsensitivePartsMaterials1GassensinglayerSnO22ElectrodeAu3ElectrodelinePt4HeatercoilNi-Cralloy5TubularceramicAl2O36Anti-explosionnetworkStainlesssteelgauze(SUS316100-mesh)7ClampringCopperplatingNi8ResinbaseBakelite9TubePinCopperplatingNiAÏòAÏòFig.1ConfigurationAConfigurationBFig.2components.TheenvelopedMQ-135have6pin,4ofthemareusedtofetchsignals,andother2areusedforprovidingheatingcurrent.ElectricparametermeasurementcircuitisshownasFig.2E.SensitivitycharacteristiccurveFig.2sensitivitycharacteristicsoftheMQ-135SENSITVITYADJUSTMENTResistancevalueofMQ-135isdifferencetovariouskindsandvariousconcentrationgases.So,Whenusingthiscomponents,sensitivityadjustmentisverynecessary.werecommendthatyoucalibratethedetectorfor100ppmNH3or50ppmAlcoholconcentrationinairandusevalueofLoadresistancethat(RL)about20KΩ(10KΩto47KΩ).Whenaccuratelymeasuring,theproperalarmpointforthegasdetectorshouldbedeterminedafterconsideringthetemperatureandhumidityinfluence.00.20.40.60.811.21.41.61.8-20-100102030405060degreeRs/Ro33%RH85%RHFig.3isshowsthetypicalsensitivitycharacteristicsoftheMQ-135forseveralgases.intheir:Temp:20Humidity:65%O2concentration21%RL=20kΩRo:sensorresistanceat100ppmofNH3inthecleanair.Rs:sensorresistanceatvariousconcentrationsofgases.Fig.4isshowsthetypicaldependenceoftheMQ-135ontemperatureandhumidity.Ro:sensorresistanceat100ppmofNH3inairat33%RHand20degree.Rs:sensorresistanceat100ppmofNH3atdifferenttemperaturesandhumidities.Fig.4MQ-1350.1110101001000ppmRs/RoAIRCO2CO¾Æ¾«NH4¼×±½±ûͪ
本文标题:MQ-135
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