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1、STANDARDISA-5.2-1976(R1992)FormerlyANSI/ISA-5.2-1976(R1992)BinaryLogicDiagramsforProcessOperationsReaffirmed13July1992TMISATheInstrumentation,–Systems,andAutomationSocietyISA-5.2-1976(R1992)BinaryLogicDiagramsforProcessOperationsISBN0-87664-331-4Copyright1976bytheInstrume
2、ntSocietyofAmerica.Allrightsreserved.PrintedintheUnitedStatesofAmerica.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherwise),withoutthepriorwrittenpermissionofthepublishe
3、r.ISA67AlexanderDriveP.O.Box12277ResearchTrianglePark,NorthCarolina27709PrefaceThisprefaceisincludedforinformationalpurposesandisnotpartofISA-5.2-1976(R1992).ThisStandardhasbeenpreparedasapartoftheserviceofISAtowardagoalofuniformityinthefieldofinstrumentation.Tobeofrealval
4、ue,thisdocumentshouldnotbestatic,butshouldbesubjecttoperiodicreview.Towardthisend,theSocietywelcomesallcommentsandcriticisms,andasksthattheybeaddressedtotheSecretary,StandardsandPracticesBoard,ISA,67AlexanderDrive,P.O.Box12277,ResearchTrianglePark,NC27709,Telephone(919)549
5、-8411,e-mail:standards@isa.org.TheISAStandardsandPracticesDepartmentisawareofthegrowingneedforattentiontothemetricsystemofunitsingeneral,andtheInternationalSystemofUnits(SI)inparticular,inthepreparationofinstrumentationstandards.TheDepartmentisfurtherawareofthebenefitstoUS
6、AusersofISAStandardsofincorporatingsuitablereferencestotheSI(andthemetricsystem)intheirbusinessandprofessionaldealingswithothercountries.TowardthisendthisDepartmentwillendeavortointroduceSI-acceptablemetricunitsinallnewandrevisedstandardstothegreatestextentpossible.TheMetr
7、icPracticeGuide,whichhasbeenpublishedbytheAmericanSocietyforTestingandMaterialsasANSIdesignationZ210.1(ASTME380-76,IEEEStd.286-1975),andfurtherrevisions,willbethereferenceguidefordefinitions,symbols,abbreviation,andconversionfactors.ItisthePolicyofISAtoencourageandwelcomet
8、heparticipationofallconcernedindividualsandinterestsinthedevelopmentofISAStandards.Partic
