O, N determination in steel samples (Inner and outer graphite crucibles)
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SuitableanalyzersnON900nONH2000UsedaccessoriesnInnergraphitecrucibles(90180)nOutergraphitecrucibles(90185)nSuitablecalibrationmaterial(NISTorother)SettingsnComparatorlevel:5mV(lowoxygen);20mV(other)nMinimumtime:15sec(oxygen);35sec(nitrogen)nMaximumtime:3:00minnPostwaiting:20secnBaselinedeviation:20mV;Step:16mV;Time:10secnMode:continuousnOutgasTime:45secPower:5kWnTimePurge:15secStability:45secnIntegrationdelayIRcell:2secTCcell:10secnAnalyse(1)Time:40secPower(1):4kWPower(2):4kWSamplepreparationMakesurethatthesurfaceofthesteelisfreefromcontaminations;otherwisecleanthesamplewithacetonep.a.andletdryatatmosphere.ProcedurenPrepareELTRAanalyzer(exchangeanhydrone,sodiumhydroxide,copperoxidewhennecessary),cleanfurnace,sampledropmechanism,electrodetipnRunthreeblankswithemptycruciblesnCalibratetheanalyzerwithsuitablecalibrationmaterial(NISTorother)(1)Filloneemptyinnercrucible(90180)inoneoutercrucible(90185)andplacethemontheelectrodetip,closefurnace(F2Button)(2)Weighcalibrationmaterial(usuallypins)(3)Placecalibrationmaterialinthesampledropmechanismandstartanalysis(F5Button)Afteranalysisgivetheinnercrucibleintowasteandfillinanewone.Theoutercruciblescanbeusedapproximately10times.Repeatsteps(1)(3)atleastthreetimes;Marktheresultsandusethecalibrationfunctioninthesoftware.
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