3511/3 OSI) International Standard InTe RnaTionaL ORGaNizATIOn FOR StanDaARDizaTIon mE mAYhaPoaHAR OPrAHU3AunR nO CtaHaaPTW3AuMU+ORGaNisATiOn Inte RnaTionaLe DEe NORmaLisaTION Process measurement control functions and instrumentation -- Symbolic representation . Part 3: Detailed symbols for instrument interconnection diagrams Fonctions et instrumentations pour la mesure et la regulation des processus industriels - Representation symbolique - Partie 3: Symboles détailles pour les diagrammes d'interconnexion d'instruments First edition - 1984-07-01 ISO 3511/3-1984 (E) UDC 744.43 : 62-52 : 003.62 Ref. No. ISO 3511/3-1984 (E) Descriptors : technical drawings, graphic symbols, measuring instruments, control devices, control functions. Price based on 19 pages ed without license from IHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). 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, in liaison 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. International Standard ISO 3511/3 was developed by Technical Committee ISO/TC 10, Technical drawings, and was circulated to the member bodies in July 1983. It has been approved by the member bodies of the following countries: Australia India Sweden Austria Netherlands Switzerland Belgium New Zealand 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 by sub-committee 3, Graphical symbols for instru- mentation. The symbols are intended to be used to represent functions and, in special cases, equipment on technical drawings such as schematic diagrams or process flow- diagrams. However, this field of engineering is closely related to electrical instrumenta- tion dealt with by IEC/TC 65 or in part by IEC/SC 3A. For this reason there has been close coordination in a joint working group and the results were accepted by members of ISO and IEC. International Organization for Standardization, 1984 C Printed in Switzerland Copyrightlnternational Oorganization for Standardization tworking permited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 3511/3-1984 (E) Process measurement control functions and Symbolic representation instrumentation Part 3: Detailed symbols for instrument interconnection diagrams Introduction Scope and field of application 0 1 This International Standard has been devised to provide a This part of ISO 3511 specifies instrument symbols for use on universal means of communication 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 IS0 3511/2. However, the symbols specified in this part of Requirements within the industries vary considerably; in 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 com