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1、STANDARDISA–71.02–1991FormerlyISA–S71.02–1991EnvironmentalConditionsforProcessMeasurementandControlSystems:PowerApproved30June1991TMISATheInstrumentation,–Systems,andAutomationSocietyISA-71.02-1991,EnvironmentalConditionsforProcessMeasurementandControlSystems:PowerI
2、SBN1-55617-324-5Copyright¤1991bytheInstrumentSocietyofAmerica.Allrightsreserved.PrintedintheUnitedStatesofAmerica.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherw
3、ise),withoutthepriorwrittenpermissionofthepublisher.ISA67AlexanderDriveP.O.Box12277ResearchTrianglePark,NorthCarolina27709PrefaceThisprefaceisincludedforinformationalpurposesandisnotpartofthestandard.ThisstandardhasbeenpreparedaspartoftheserviceofISAtowardagoalofuni
4、formityinthefieldofinstrumentation.Tobeofrealvalue,thisdocumentshouldnotbestatic,butshouldbesubjecttoperiodicreview.Towardthisend,theSocietywelcomesallcommentsandcriticisms,andasksthattheybeaddressedtotheSecretary,StandardsandPracticesBoard,ISA,67AlexanderDrive,P.O.
5、Box12277,ResearchTrianglePark,NC27709,Telephone(919)549-8411,e-mail:standards@isa.org.TheISAStandardsandPracticesDepartmentisawareofthegrowingneedforattentiontothemetricsystemofunitsingeneral,andtheInternationalSystemofUnits(SI)inparticular,inthepreparationofinstrum
6、entationstandards.TheDepartmentisfurtherawareofthebenefitstoUSAusersofISAstandardsofincorporatingsuitablereferencestotheSI(andthemetricsystem)intheirbusinessandprofessionaldealingswithothercountries.Towardthisend,thisDepartmentwillendeavortointroduceSI-acceptablemet
7、ricunitsinallnewandrevisedstandardstothegreatestextentpossible.TheMetricPracticeGuide,whichhasbeenpublishedbytheInstituteofElectricalandElectronicsEngineersasANSI/IEEEStd.268-1982,andfuturerevisionswillbethereferenceguidefordefinitions,symbols,abbreviations,andconve
8、rsionfactors.ItisthepolicyofISAtoencourageandwelcometheparticipationofallconcernedindividualsandinterestsinthedevelopmentofISAstandards.Pa
