PPM _ Oxygen Adjust

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1、OptimizationofResidualO2ContentforRehmReflowOvenReviewthischeckliststepbystepbeforechangingovensettings.No:ItemstobeCheckedOK1Istheoxygenanalyzerstillcorrectlycalibrated?2IsnitrogenqualityOKfromthesupplyside(<5ppm)?3Isnitrogenpressuresetto5.2barattheoven?4Arenitrogenflowratescorrectlyse

2、t(calibrationreport)?5Arethecableglandsattherearpaneloftheprocesschambersealedwithglycerin?6Istheinsideoftheprocesschamberclean?7Arethesiliconsealsandtheirmatingsurfacesclean?8Aretheverticalovenflangesbetweentheinlettunnelandtheheatingchamber,andbetweentheheatingchamberandthecoolingzone

3、freeofleaks(compressedairtest)?9Dotheheatingchamber,thecoolingzoneandthesupplementarycondensatetrapclosecompletely?Sealsmustmakecontactallthewayaround.(papertest,compressedairtest).10Areheatingfandirectionofrotationandfrequencycorrect?11Arecoolingzonefandirectionofrotationandfrequencyco

4、rrect?12Isexhaustfandirectionofrotationcorrect?13Issupplementarycondensatetrapdirectionofrotationcorrect?13Areheatingandcoolingzonefanpropellersclean(perhapsnothroughput)?14Isexhaustvolumecorrectlyadjusted(calibrationreport)?15Isthenozzlerodcorrectlyinstalled(inclinationanddirection),an

5、darethethrough-holesclean?16Aretheballvalvesatthesupplementarycondensatetrapcorrectlypositioned(calibrationreport)?17Isthenozzlesheetinthecoolingzoneproperlysealedwithsiliconoutsideatthetop?18Istheexhaustductclean?19Aretheexhaustventsattheinletandoutletclean?20Areexhaustflowratesadjuste

6、dattheinletandtheoutletsuchthatnooverpressureoccursateithertheinletortheoutlet(checkwithjossstick)?21Arethenozzlesheetsinthecoolingzoneclean?22Arethecoolersandfiltersinthesupplementarycondensatetrapcleanandarethesheetmetalguidescorrectlyinstalled?23AretheCyclonesandFiltercleanandclosed,

7、DuringtheTestPullinandpulloutthepowerconnecterfromCyclonestofundoutifitsanyinfluentfromtheCyclonesandFilter24Arethepartitioningcurtainsupright,oraretheytiltedorevenshearedoff?25DoestheproblemexistfornarrowPCBsaswell?26Istheoveninadraft-freeenvironment?Disconnecttheexhausthosesa