New ISA-5.1 standard for Instrumentation and Control – Symbols and Identification

Process safety

The ISA-5.1 standard for Instrumentation and Control – Symbols and Identification was thoroughly revised in 2024.

New ISA-5.1 standard for Instrumentation and Control – Symbols and Identification

The ISA-5.1 standard for Instrumentation and Control – Symbols and Identification was thoroughly revised in 2024.
Main changes:

Broader scope – Control is now explicitly included in the title and content
New & modified symbols for, among others, shared displays, remote setpoints, flame ionisation and actuators
Improved readability and a clearer table structure
Loop diagram symbols added
Annexes moved to two separate technical reports:
- ISA-TR5.1.02-2024: Identification System Guidelines
- ISA-TR5.1.03-2024: Graphic Symbol Guidelines

These updates are essential for anyone working with P&IDs and process automation.

Case: P&ID upgrade

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