OSI International Standard 3511/3 NTEANATIONALOAGANI LE DE NOAMALISATiON Process measurement control functions and instrumentation -Symbolic representation - Part 3:Detailed symbols for instrument interconnection diagrams Fonctions et instrumentations pourla mesure et la regulation des processus industriels -Representation symbolique- Partie3:Symbolesdétaillespourlesdiagrammesd'interconnexiond'instruments First edition -1984-07-01 1S0 3511/3-1984 (E) Ref.No.ISO3511/3-1984(E) UDC744.43:62-52:003.62 Descriptors :technical drawings,graphic symbols,measuring instruments,control devices,control functions. Price based on 19 pages Coovriaht Intemational Oraanization for Standardization Foreword ISO(the International Organization for Standardization)is a worldwide federation of nationalstandardsbodies(lsO memberbodies).The work of developing International Standards is carried out through isO technical committees.Every member body right to be represented on that committee.International organizations.governmental and non-governmental,inliaison with IsO,also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. InternationalStandardISO3511/3wasdevelopedbyTechnicalCommitteeISO/TC10 Technicaldrawings,andwascirculatedtothememberbodies inJuly1983 It has been approved by the member bodies of the following countries: Australia India Sweden Austria Netherlands Switzerland Belgium New Zcaland United Kingdom Finland Poland USA. Germany,F.R Spain USSR The member body of the following country expressed disapproval of the document on technical grounds: Italy This part of ISO 3511 was developed bysub-committee 3,Graphicalsymbols for instru- cases,equipment on technical drawings such as schematic diagrams or process flow- diagrams.However,this field of engineering is closely related to electrical instrumenta- close coordination in a joint working group and the results were accepted by members of ISO and IEC. OInternationalOrganizationforStandardization,1984. Printed in Switzerland Coovriaht Intemational Oraanization for Standardization 3511/3-1984(E) INTERNATIONAL STANDARD ISO Process measurement control functions and instrumentation -Symbolic representation - Part 3:Detailed symbols for instrument interconnection diagrams 0 Introduction 1Scope and field of application This International Standard has been devised to provide a This part of ISO3511specifies instrument symbols for use on universal means ofcommunication among the various interests interconnection diagrams used for the design,installation,and involved in the design,manufacture,installation and operation maintenance of process measurement and control systems. of measurement and control equipment used in the process in- These detailed symbols are not normally intended for drawings dustries. that use the functional symbols given in ISO 3511/1 and Requirements within the industries vary considerably;in ISO 3511/2.However,the symbols specified in this part of Iso 3511 show,by detailing the components,the external con- recognition of this,this International Standard is presented in nections between units of equipment. four parts as follows: Information on the internal connections in units is not normally Part 1:Basic requirements (directed towards the needs of included,but references to the appropriate circuit or wiring those employing comparatively simple measurements and diagrams may be provided. control means). When an instrument is composed of more than one functional Part 2:Extension of basic requirements. part,the different symbols may be combined,for example, Part 3:Detailed symbols for instrument interconnection recorder controller. diagrams The dimensions of the symbols are unspecified,provided the Part 4:Basic symbols for process computer,interface,and ratio of the side lengths is maintained according to this part of SO 3511.2) share