TS ISO 14617-6

TS ISO 14617-6 addresses graphical symbols used to represent measurement and control functions in diagrams. In practical automation and process documentation, these symbols help make sensing, signal flow, control action and monitoring relationships readable at a glance; in simple applications, the same symbols may also stand for the components or devices that perform those functions.

In general technical terms, measurement and control notation helps distinguish what variable is being observed, where measurement takes place and how the control action is applied. This distinction matters in process flow diagrams, instrumentation diagrams and control schematics because the same function can be implemented by different hardware arrangements. The standard’s scope is focused on the meaning and use of the symbols, while the basic rules for creating and applying graphical symbols are addressed in ISO 81714-1 and the broader ISO 14617 framework is introduced in ISO 14617-1.

How symbol meaning relates to equipment representation

A key idea in this part is that the same symbol may represent either a function or, in a simpler context, the component or device that carries out that function. For that reason, interpreting a diagram requires attention not only to the symbol itself but also to the drawing context and its relationship with surrounding notation. Consistent use of measurement and control symbols supports clearer reading of equipment interactions, feedback loops and control logic across technical documentation.

• Provides graphical symbols for measurement and control functions.
• In simple applications, the same symbols may represent the corresponding components or devices.
• Directs users to ISO 14617-5 for symbols for measurement and control components and devices.
• Refers to ISO 81714-1 for the fundamental rules for creating and applying graphical symbols.
• Refers to ISO 14617-1 for the overall framework of ISO 14617, including registration numbers and usage rules.