JIS B 7994-2021.docx

JISJAPANESEINDUSTRIA1.STANDARDTrans1.atedandPub1.ishedbyJapaneseStandardsAssiat>nJISB7994-(JEMIMA/JSA)Continuousana1.yzerformercuryinf1.uegasICS13.(M0.40J71.(M0.40Refeenconumber:JISB7994:2021(E)DateofEstab1.ishment2016-11-21DateofRevision-2021-08-20DateofPub1.icNoticeinOfficia1.Gazette-2021-08-20Investigatedby：JapaneseIndustria1.StandardsCommitteeStandardsHoardforISOareaJISB7994:2O2bFirstEng1.isheditionpub1.ishedin20224)9Trans1.atedandpub1.ishedby:JapaneseStandardsAssociationMiUMTBUiIdi呷3-13-12,MMMinawkU,Tokyo,108-0073JAPAX!ntheCVentofanydoubtsarisingastothecontents,theorigina1.J1.Sistobethefina1.authority.©JSA2022A1.1.righMrv*rvM.1.nkMo<herwt*specified,nopartQfth1.*pub1.k*4tk>nnuybereproducedaru1.UUedinanyformorbyany11vjm,e1.ectronsorInedUnka1.IIKhJdMgphotocopyingandmk*rofi1.m,withoutpermixctonmwritingfromthrpubUchc.H71INPrintedInRpanContentsPage1 Scope2 Normativereferences3 Termsanddefinitions4 Typesandmeasuringrangesofana1.yzers5 Performanceofana1.yzer36 Configurationofana1.yzer46.1 Genera1.structura1.requirements46.2 Examp1.esofconguration47 Performancetests97.1 Testconditions97.2 GasesusedIbrtesting97.3 Ca1.ibration107.4 Testmethod108 Testreport119 Marking1210 Instructionmanua1.12AnnexAGnformative)Ca1.ibrationgaspreparationequipment13(i)ForewordThisJapaneseIndustria1.StandardhasbeenrevisedbytheMinisterofEconomy,TradeandIndustrythroughde1.iberationsattheJapaneseIndustria1.StandardsCommitteeastheresu1.tofproposa1.forrevisionofJapaneseIndustria1.StandardsubmittedbyJapanE1.ectricMeasuringInstrumentsManufacturersAssociation0E1.IM)JapaneseStandardsAssociation(JSA)withadraftbeingattached,basedontheprovisionofArtic1.e12.paragraph(1)oftheIndustria1.Standardizationctapp1.iedmutatiamutandispursuanttotheprovisionofArtic1.e16ofthesaidct.Theditionrep1.acesthepreviousedition(J1.SB7994:2016),whichhasbeentechnica1.1.yrevised.ThisJISdocumentisprotectedbytheCopyrightct.Attentionisdrawntothepossibi1.itythatsomepartsofthisStandardmayconf1.ictwithpatentrights,pub1.ishedpatentapp1.icationoruti1.itymode1.rights.There1.erantMinisterandtheJapaneseIndustria1.StandardsCommitteearenotresponsib1.eforidentifyinganyofsuchpatentrights,pub1.ishedpatentapp1.icationoruti1.itymode1.rights.Continuousana1.yzerformercuryinf1.uegas1 ScopeThisJapaneseIndustria1.Standardspecifiesrequirementsforana1.yzersforperformingcontinuousmeasurementoff1.uegasemittedfromafixedsourceforthepurposeofmonitoringitsgaseousmercuryconcentration(hereafterreferredtoasana1.yzers).Theprincip1.eofthemeasurementspecifiedinthisStandardisbasedonthereductionofmeta1.1.icmercuryormercuryCOmPOUndSintheuegasusingareducingagentandtheatomicabsorptionspectrometry.2 NormativereferencesPartora1.1.oftheprovisionsofthefo1.1.owingstandards,throughreferenceinthistext,constituteprovisionsofthisStandard.ThemostrecenteditionsofthestandardsGn"c1.udingamendments)indicatedbe1.owsha1.1.beapp1.ied.JISB7551Variab1.earea/JowmetersJISC1302Insuhtionresistancetesters.JISK0095Methodsforsamp1.ingofAUegasJISK0212Technica1.termsforana1.yticsIchemistry(optica1.part)JISK0215Technica1.termsforana1.ytica1.chemistry(Ana1.ytica1.instrumentpart)JISK0222MethodsfordeterminationofmercuryinstackgasJISK8136Tin(II)ch1.oridedihydrate(Heagent)JISK8139Mercury(II)ch1.oride(Reagent)JISK8541Nitricacid(Reagent)JISK8780Pyroga1.1.o1.(Reagent)JISK95021.(+)-scorbicacid(Rcgent)JISZ8103G1.ossaryoftermsusedinmeasurement3 TermsanddefinitionsForthepurposeofthisStandard,thefo1.1.owingtermsanddefinitions,andthosegiveninJISK0212.JISK0215.JISK0222andJISZ8103app1.y.3.1samp1.egasf1.uegaswhichisintroducedintothespectrometerafterbeingpretreatedthroughafi1.terorthe1.ike3.2fixedsourcef1.uegagaswhichisproducedbyburningfue1.sorothermateria1.sinafactoryorbusinessfaci1.ity,orgeneratedinvariouRmanufacturingprocesses,andwhichisdischargedintoductsorchimneysfordiffusionintheatmosphere3.3gaseousmercurymeta1.1.icmercuryanddiva1.entmercuryinagaseousstate3.4concentrationmassofatargetsubstancecontainedperunitvo1.umeofagaseouseubetanceundertheconditionofpressureof101.32kPa.temperatureof273.15Kanddrygas3.5zerodriftvariationoftheana1.yzerindicationoveracertainperiodoftime!respondingtotheminimumsca1.eoftheana1.yzer3.6pandriftvariationoftheana1.yzerindicationoveracertainperiodoftimecorrespondingtothemaximumsca1.eoftheana1.yzer3.7predeterminedf1.owratef1.owrateofasamp1.egas,ca1.ibrationgasorthe1.ikespecifiedforanana1.yzer3.8indicationerrorpercentageofthedifferencebetweenthenomina1.va1.ueandtheana1.yzerindicationofthencentrationofthemidwaypointca1.ibrationgasintroducedintoanana1.yzertothemaximumsca1.eoftheana1.yzer3.9responsetimesumofthe1.agtimeandrisetimerequiredforanana1.yzerindicationtoreachava1.uecorrespondingto90%ofthefina1.indicationafterintroductionofatestgas3.10dryreductiontypeana1.yzertypethatreducesamercurycompoundtometa1.1.icmercurythroughtheuseofaso1.idreducingagent3.11wetreductiontypeana1.yzertypethatreducesamercurympondtometa1.1.icmercurythroughtheuseofaso1.ution-typereducingagent4 Typesandmeasuringrangesofana1.yzersThegasana1.yzersareeitherofdryreductiontypeorwetreductiontype.Themeasuringrange(hereafterreferredtoastherange)ofeachana1.yzertypesha1.1.beinaccordancewithTab1.e1.Tab1.e1Typesandrangesofana1.yzersTyPCEXamPIGofrange"1.DryreductiontypoMinimumsca1.eva1.ue0.maximumsca1.eva1.ue50gm,to5jm3WetreductiontypeMinimumsca1.eva1.ue0.maximumsca1.eva1.ue50gmato5gm3Note,ThemaximumseaIeva1.ueofeacht>rp<sha1.1.bese1.ectednothattheFangixuit;Ib1.eforUhs%pecifPUrPQfuc6Performanceofana1.yzerTheana1.yzersha1.1.satisfytherequirementsgiveninTab1.e2withrespecttothemaximumsca1.eva1.ueofeachrangewhentestedbythemethodsspecifiedinC1.ause7.Tab1.e2Performanceofana1.yzerItemRequiredperfornvnceTertmethodDryreductiontypeWetreductiontypeRepeatabi1.ity+2%ofthemaximum*ca1.cva1.uc+3%Ofthemaximumj,a1.cva1.ue7.4a)Zerodrift±2%ofthemaximumsca1.eva1.ue仝3%o(themaximumsca1.eva1.ue7.4b)Spandrift±2%ofthemaximumsca1.eva1.ue÷3%ofthemaximumsca1.eva1.ue7.4c)Indicationerror+3%ofthomaximumsca1.eva1.ue7.4d)Responsetime5minutesmax.7.4e)Stabi1.ityofindicationagainstf1.owratef1.uctuationofsamp1.egax+2%ofthemaximumsca1.eva1.ue7.4Stabi1.ityagsinxtvo1.Ugf1.uctuation±2%ofthemaximumm¼i1cva1.ue7.4g)WithStandvo1.tageNoabnorma1.ities7.4h)Insu1.ationrc»i8Uincc5Mmin.7.4i)6Configurationofana1.yzer6.1 Genera1.structura1.requirementThestructureoftheana1.yzersha1.1.mp1.ywitheachofthefo1.1.owingrequirements.a) Theana1.yzerhasapropershapewitheachpartbeingassemb1.edandfinishedcorrect1.yandisrobustinstructure.b) Theana1.yzerworkssafe1.yandsmooth1.ywithoutrisksundernorma1.operatingconditions.c) Partsconstitutingtheana1.yzerareconstructedtopreventtherisksofmechanica1.ande1.ectrica1.fai1.uresandtoberiskfree.d) Theana1.yzerisconstructedtobefreefromanyoperationa1.troub1.esduetodewformationorthe1.ike.e) Partsoftheana1.yzerthatarec1.osetoaheatgeneratingcomponentsuchasa1.ightsourceorheaterareconstructedtopreventdeformationorfunctiona1.dec1.ineduetotheheat.DTheana1.yzerisconstructedtoa1.1.oweasymaintenanceandinspectionswithoutanyrisk.g) Themateria1.f1.andstructureofthecomponentsuptothereducingpartdonota1.1.owmercurycompoundinthef1.uegastobeadsorbedandaredesignedtoheatthewatervapourinthef1.uegastopreventitscondensation.h) Thecomponentsfromtheout1.etofthereducingpartuptothespectrometeraremadeofmateria1.sthatdonota1.1.owadsorptionofmercuryatthepartsincontactwiththegasthatmayaffectthemeasurement.6.2 Examp1.esofconfiguration6.2.1 Genera1.Figure1andFigure2showanexamp1.eofconfigurationofadryreductiontypeana*Iyzerandawetreductiontypeana1.yzer,respective1.y.Eachana1.yzeriscomposedofasamp1.ingpart,aspectrometer,andsoon.Thedetai1.sofeachcomponentoftheana1.yzerareprovidedin6.2.2to6.2.6.with.2.5and6.2.6on1.yapp1.yingtothewetreductiontype.IDrain(waste1.iquid)Figure1Examp1.eofconfigurationofdryreductiontypeana1.yzerSamp1.ingpartSamp1.ingtubePrimaryfi1.terCa1.ibrationgain1.et1CRe-MduringdunPHrttube_e-T-1._-1.!Samp1.ogasin1.otHeaurGarbquidSecond,Separatinparyfi1.terpartDehumidificationCahbrationgasin1.et21partJhangco,verva1.veSamp1.mRpartSuctioncontro1.pumpva1.ve,I-Reducingagentso1.utionfeedingea.partgent需HWntpump1JIDrain(w<*U*1.iquid)Figure2Examp1.eofconfigurationofwetreductiontypeana1.yzer6.2.2Samp1.ingpartThesamp1.ingpartsha1.1.haveafunctionofremovingdustinthef1.uegaR,and.ifrequired.removingmoistureandcorrosivegasessuchashydrogenSUIfid。su1.furoxidesandnitrogenoxidesorkeepingtheirquantitiesatcertain1.eve1.s,andsha1.1.bedesignedtosupp1.ytothespectrometerasnecessaryandconstantquantityofthesamp1.egascontinuous1.yorintermittent1.ywhi1.eminimizingthe1.ossofthetargetcomponentstotheextentpossib1.e.Inaddition,itsha1.1.bedesignedtoreducethediva1.entmercuryinthef1.uegastometa1.1.icmercuryinadvance.Thesamp1.ingpartsha1.1.becomposedofthefo1.1.owingcomponentsa)toD.Themateria1.ofeachcomponentsha1.1.bese1.ectedaccordingtothef1.uegasandsamp1.egasproperties.a) Samp1.ingtubeThesamp1.ingtubeshaDbeatubemadeoftrtanium.ceramics,quartzorthe1.ike,andbefittedtothegasductwa1.1.orthe1.ikeforsamp1.ingthef1.uegas.b) Primazyfi1.terTheprimaryfi1.tersha1.1.beusedforremovingthedustinthef1.uegasandsha1.1.beprovidedwithamechanismtoheatthef1.uegasupto120orhigherforpreventingthemoistureintheuegasfromcondensing.Thefi1.termateria1.sha1.1.beg1.assfibreorthe1.ike.Thisfi1.termaybeomittedifareducingparthavingafi1.teringfunctionisinsta1.1.edimmediate1.yafterthesamp1.ingtube.NOTEWhenitis1.ike1.ythatthedustcaughtintheprimaryfi1.termayadsorbthemercury,theprimaryfi1.terisrequiredtoberep1.acedbeforethisadsorptionaffectathemeasurement.c) ReducingpartThereducingpartsha1.1.haveamechanismtoreducethediva1.entmercuryinthef1.uegastometa1.1.icmercuryinadvance.See6.2.4fordetai1.s.d) ConduittubeTheconduittubesha1.1.beatubemadeoftetraf1.uoroethy1.eneresinorthe1.ikeandusedforguidingthesamp1.egas.Itsha1.1.beprovidedwithaheatingmechanism,asnecessary,forpreventingthemoistureinthesamp1.egasfromcondensingonitswaythroughthetube.e) Gas-1.iquidseparatingpartThegas-1.iquidseparatingpartsha1.1.beusedforseparatingtheCOndenSedwaterand.inthecaseofawetreductiontype,thereducingagentso1.utionfromthesamp1.egas.andsha1.1.bemadeofg1.assorothermateria1.swhichdonotadsorbmercury.Figure1andFigure2showagasa1.iquidseparatingpartthatisconfiguredwiththeintermittentdrainingtypecondenedwatertrapgiveninFigure6b)ofJISK0095orthe1.ike.0DehumidificationpartThedehumidicationpartsha1.1.beadeviceforfurtherremovingthemoisturefromthesamp1.egaswhichhaspassedthroughthegase1.iquidseparatingpart,andsha1.1.bese1.ectedsuitab1.yfromamongtheaircoo1.ingtype(ambienttemperature),e1.ectronicCoo1.ingtype,Semipermeab1.emembranegasphasedehumidicationtypeorothertype.g) Secondaryfi1.terThesecondaryfi1.tersha1.1.beusedforremovingthefinedustinthesamp1.egasandbemadeofg1.assfibre,tetraf1.uoroethy1.eneresinorthe1.ike.Iftheinf1.uenceofthedustonthespectrometerissufficient1.ysma1.1.,thesecondaryfi1.termaybeattachedimmediate1.yafterthespectrometer.h) Ca1.ibrationgasin1.etThegasca1.ibrationin1.etsha1.1.beprovidedateitheroneortwop1.acesshowninFigure1andFigure2,andse1.ectedanduseddependingontheintendedpurpose.i) Changeoverva1.veThechangeoverva1.vesha1.1.beamanua1.ore1.ectromagneticva1.vemadeofamateria1.resistanttocorrosionandnotadsorbingmercury.j) SuctionpumpThesuctionpumpsha1.1.genera1.1.ybeadiaphragmtypepumpandusedforsuckingthesamp1.egasorthe1.ike.Thepartsofthepumptobeincontactwiththegassha1.1.bemadeofacorrosionresistantmateria1.suchashardviny1.ch1.orideresin.k) F1.owcontro1.VaIVeThef1.owcontro1.va1.vesha1.1.beaneed1.eva1.veorthe1.ikemadeofarrosionresistantmateria1.l) F1.owmeterThef1.owmetersha1.1.beSUfnCientIycorrosionresistant.Avariab1.eareaf1.owmeterspecifiedinJISB7551orthe1.ikesha1.1.beused.6.2.3SpectrometerTheconcentrationofmeta1.1.icmercuryanddiva1.entmercurycontainedinthef1.uegassha1.1.bedeterminedbytheatomicabsorptionspectrometryafterthediva1.entmerCUryhasbeenreducedtometa1.1.icmercury.Thespectrometersha1.1.becomposedofa1.ightsourcepart,absorptionceD.detectionpart,dataprocessingpartandsoon.Somespectrometershavethefo1.1.owingfunctionsforenhancementofthesensitivityandstabi1.ity: doub1.ebeamsystemforthepurposeofsuppressingtheinf1.uenceof1.ightintensityf1.uctuationbyexp1.oitingtheabsorbancedifferencebetweenthe1.ighttobemeasUredandthereference1.ight； a1.ternatemeasurementsofthezerogasandthesamp1.egasforthepurposeofsuppressingtheinf1.uenceof1.ightintensityf1.uctuationbyexp1.oitingtheabsorbancedifferencebetweenthezerogasandthesamp1.egas：一keepingthe1.ightsourcetemperatureCOngtantforthepurposeofsuppressingchangeinthe1.ightintensitySubstancessuchaspo1.ycycHcaromatichydrocarbonsmayinterferewiththeatomicabsorptionspectrometry.Theinf1.uenceoftheinterferingcomponentssha1.1.becorrectedforasrequired.a) 1.ightsourcepartTheIightsourcepartsha1.1.bea1.ow-vo1.tagemercurybmporthe1.ikewhichemitsthespectrumnecessaryformercuryana1.ysis.b) Absorptionce1.1.Theabsorptionce1.1.sha1.1.haveastructureforpassingthegaswithaquartzwindoworthe1.ikeinsta1.1.edatbothends.c) DetectionpartThedetectionpartsha1.1.beaphototube,so1.idstatedetectororthe1.ike,whichconvertstheintensityoftheincident1.ighttothedetectortoacorreSpondinRe1.ectricsigna1.d) DataprocesingpartThedataprocessingpartsha1.1.havethefunctionofprocessingthedata,andindicatingandrecordingtheabsorbance,concentration,ca1.ibrationcurve,measurementresu1.ts,etc.bymeansofadisp1.ay,printer,recorder,etc.6.2.4 Reducmgparta) DryreductiontypeThereducingpartinthedryreductiontypeana1.yzersha1.1.haveamechanismtoheatRo1.idreducingagentsuchasa1.ka1.imeta1.sa1.t,aIkaa1.ine-earthmeta1.sa1.tandstannousch1.orideputinacontainermadeofg1.assorthe1.ikeinordertoacce1.eratethereductivereactions.Itsha1.1.bedesignedtoa1.1.owrep1.acementoftheso1.idreducingagentinaboutatwomonthperiod.NOTE1highconcentrationofacidgasessuchassu1.furoxidesandnitrogenoxidescontainedintheuegaspromoteneutra1.izationoftheso1.idreducingagent.Oncetheso1.idreducingagentisneutra1.ized,theacidgasespassthroughthereducingpartwithoutbeingreducedandcauseinterferencewiththeatomicabsorptionana1.ysisorcontaminationoftheabsorptionce1.1.windowsofthespectrometer.Inthiscasetherefore,theso1.idreducingagentshou1.dberep1.acedear1.ybeforethementionedinterferencesoccur.b) WetreductiontypeThereducingpartinthewetreductiontypeana1.yzersha1.1.bringthesamp1.egas.previous1.yremovedofdust,intocontinuouscontactwiththereducingagentso1.ution(see6.2.6)inordertoreducethediva1.entmercuryinthesamp1.egastometa1.1.icmercury,andsha1.1.becapab1.eofheatingthereducingagentso1.utionuptoabout80afterOOntaetwi