Overview
ISO 14617-2:2002 - Graphical symbols for diagrams, Part 2: Symbols having general application defines a library of general-purpose graphical symbol elements used to build complete symbols for products, devices and functions in technical diagrams. Part 2 specifies symbol elements of a general character (labels, conversion forms, amplifiers, hysteresis, envelopes, directions, etc.) intended for use in process plant and product documentation where consistent, unambiguous diagram notation is required.
Key topics and technical requirements
- Scope and purpose: Provides symbol elements mainly for composing complete symbols representing components, functions and equipment where specific pre-defined symbols do not exist.
- Symbol creation rules: References ISO 81714-1 (basic rules for graphical symbol design) and ISO 14617‑1 (indexes and presentation rules) for consistent construction, placement and annotation.
- Normative references: Works alongside ISO 31-11 (mathematical signs), IEC 60617 and related parts of the ISO 14617 series.
- Terms & definitions: Defines essential terms used with graphical symbols (complex device, functional unit, hysteresis, dead band, variability, envelope/tank, input/output label, etc.).
- Component and function elements: Includes symbol forms for complex devices, input/output labels, conversion, amplification, delay, hysteresis, stabilizing, enabling/compensating inputs, high/low limitation, dead band, selection (highest/lowest), logic functions (AND/OR), synchronization and more.
- Application rules: Specifies when to use a generic “complex device” symbol, how to add mnemonic abbreviations, mathematical expressions, graphical details or short descriptive text, and how to place annotations (top-centred notation, inside/outside outlines).
- Variability & characteristics: Covers variability, adjustability, inherent variability, directions, radiation, envelopes, materials and simplifications for diagrammatic clarity.
Applications and users
ISO 14617-2 is practical for:
- Technical authors and CAD drafters creating standardized diagrams for mechanical, process, electrical and instrumentation systems.
- Design and process engineers documenting equipment, control logic and functional relationships in P&IDs, system schematics and technical manuals.
- Standards committees and documentation teams harmonizing symbol libraries across projects or organizations.
Benefits include improved consistency, reduced ambiguity in technical diagrams, and easier cross-disciplinary communication.
Related standards
- ISO 14617 series (Parts 1, 3, 6, etc.) - broader symbol sets and indexes
- ISO 81714-1 - rules for design and application of graphical symbols
- IEC 60617 - complementary graphical symbol elements for diagrams
- ISO 31-11 - mathematical signs and symbols
Keywords: ISO 14617-2:2002, graphical symbols, diagrams, process documentation, symbol library, P&ID, input/output labels, hysteresis, standardization.