TS ISO 15519-2

TS ISO 15519-2 addresses how measurement, control and actuation are represented in diagrams used for the process industry. Its purpose is to make instrumentation and automation information clear, consistent and technically readable so that process engineers, operators and maintenance teams can interpret the same diagram in the same way. In practical terms, it helps structure the relationships between sensors, control functions and final control elements on process documentation.

This part should be read alongside the broader diagram-preparation rules in ISO 15519-1. That parent part covers general diagram topics such as diagram types, layout, graphical symbols, lines and connections, and reference designations. By contrast, TS ISO 15519-2 focuses specifically on measurement and control representation. For electrical diagrams, the relevant guidance is given in IEC 61082-1, which reflects the different conventions used for electrotechnical documentation.

How measurement and control information is organised

In general technical documentation, measurement and control diagrams show how a process variable is sensed, processed and, when needed, acted upon. Measurement relates to monitoring variables such as temperature, pressure, flow or level. Control is the function that keeps those variables within a desired operating range, while actuation converts control intent into physical action through devices such as valves, drives or similar equipment. Clear representation matters because the same process can involve field instruments, control logic and final elements that must be distinguished unambiguously.

Documentation value of this part

• Provides rules and guidance for representing measurement, control and actuation in process-industry diagrams.
• Builds on the general diagramming framework of ISO 15519-1 rather than repeating it.
• Separates process-instrumentation documentation from electrotechnical diagrams by pointing to IEC 61082-1.