71.04-Environmental-Conditions-for-Process-Measure

EnvironmentalConditionsforProcessMeasurementandControlSystems:AirborneContaminantsApproved3February1986ISA–S71.04–1985STANDARDCOPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000COPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000CopyrightË1985bytheInstrumentSocietyofAmerica.Allrightsreserved.PrintedintheUnitedStatesofAmerica.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherwise),withoutthepriorwrittenpermissionofthepublisher.ISA67AlexanderDriveP.O.Box12277ResearchTrianglePark,NorthCarolina27709ISA-S71.04,EnvironmentalConditionsforProcessMeasurementandControlSystems:AirborneContaminantsISBN0-87664-895-2COPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000COPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000ISA-S71.04-19853PrefaceThisprefaceisincludedforinformationalpurposesandisnotpartofISA-S71.04.ThisstandardhasbeenpreparedaspartoftheserviceintheISAtowardagoalofuniformityinthefieldofinstrumentation.Tobeofrealvalue,thisdocumentshouldnotbestatic,butshouldbesubjecttoperiodicreview.Towardthisend,theSocietywelcomesallcommentsandcriticisms,andasksthattheybeaddressedtotheSecretary,StandardsandPracticesBoard,ISA,67AlexanderDrive,P.O.Box12277,ResearchTrianglePark,NC27709,Telephone[phone],e-mail:[e-mail]cesDepartmentisawareofthegrowingneedforattentiontothemetricsystemofunitsingeneral,andtheInternationalSystemofUnits(SI)inparticular,inthepreparationofinstrumentationstandards.TheDepartmentisfurtherawareofthebenefitstoU.S.A.usersofISAstandardsofincorporatingsuitablereferencestotheSI(andthemetricsystem)intheirbusinessandprofessionaldealingswithothercountries.Towardthisend,thisDepartmentwillendeavortointroduceSI-acceptablemetricunitsinallnewandrevisedstandardstothegreatestextentpossible.TheMetricPracticeGuide,whichhasbeenpublishedbytheInstituteofElectricalandElectronicsEngineersasANSI/IEEEStd.268-1982,andfuturerevisionswillbethereferenceguidefordefinitions,symbols,abbreviations,andconversionfactors.ItisthepolicyoftheISAtoencourageandwelcometheparticipationofallconcernedindividualsandinterestsinthedevelopmentofISAstandards.ParticipationintheISAstandards-makingprocessbyanindividualinnowayconstitutesendorsementbytheemployerofthatindividual,oftheISA,orofanyofthestandardsthatISAdevelops.Theinformationcontainedinthepreface,footnotes,andappendicesisincludedforinformationonlyandisnotapartofthestandard.Thisdocumentisoneofseveralstandardscoveringvariousenvironmentalconditionsaffectingprocessmeasurementandcontrolsystems.Indevelopingthisstandard,thecommitteegoalsincludedthefollowing:1)Toprovideapracticalstandardthatcanbeappliedwithaminimumofresearchandtechnicaleffortbytheuser.2)Toprovideaconcisemethodofstatingenvironmentalclassificationsforconvenientcommunicationbetweenusersofthestandard.3)Tocoverreal-worldrangesofeachclassifiedparameter.Thisstandardislimitedtoairbornecontaminantsandbiologicalinfluencesonly,coveringcontaminationinfluencesthataffectindustrialprocessmeasurementandcontrolsystems.ThepersonslistedbelowservedasmembersofISACommitteeSP71,whichpreparedthisstandard.NAMECOMPANYW.Holway,ChairmanTheFoxboroCompanyD.BoyleConsultantCOPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000COPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,20004ISA-S71.04-1985NAMECOMPANYD.CumminsPurafil,Inc.J.DuffyFisherControlsCompanyK.GulickDigitalEquipmentCorporationM.HuzaCircul-AireInc.F.KentFischerandPorterCompanyE.J.LaderouteTheFoxboroCompanyM.LombardiHoneywell,Inc.R.MagnusonHewlettPackardW.T.MitchellDowChemical,USAR.Prescott(Director)MooreProductsE.RasmussenFluorEngineers&Constructors,Inc.W.T.RhodesCONOCO,Inc.R.H.WaltonExxonCompany,USAThisstandardwasapprovedforpublicationbytheISAStandardsandPracticesBoardinFebruary1985.NAMECOMPANYN.Conger,ChairmanFisherControlsCompanyP.V.BhatMonsantoCompanyW.CalderIIITheFoxboroCompanyR.S.CrowderShipStarAssociatesB.FeikleBaileyControlsCompanyH.S.HopkinsWestinghouseElectricCompanyJ.L.HowardBoeingAerospaceCompanyR.T.JonesPhiladelphiaElectricCompanyR.KellerTheBoeingCompanyO.P.Lovett,Jr.ISISCorporationE.C.MagisonHoneywell,Inc.A.P.McCauleyChagrinValleyControlsInc.J.W.MockBechtelCorporationE.M.NesvigERDCOEngineeringCorporationR.PrescottMooreProductsCompanyD.E.RapleyISTSC.W.ReimannNationalBureauofStandardsJ.RennieFactoryMutualResearchCorporationW.C.WeidmanGilbertCommonwealthInc.K.WhitmanConsultantP.Bliss*ConsultantB.A.Christensen*ContinentalOilCompanyL.N.Combs*RetiredR.L.Galley*ConsultantT.J.Harrison*IBMCorporationR.G.Marvin*RoyG.MarvinCompanyW.B.Miller*MooreProductsCompanyG.Platt*RetiredJ.R.Williams*StearnsCatalyticCorporation*DirectorEmeritusCOPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000COPYRIGHT2000InstrumentSocietyofAmericaInformationHandlingServices,2000ISA-S71.04-19855Contents1Purpose...............................................................