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ISO 3511-2 1984 Edition, January 1, 1984
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Process Measurement Control Functions and Instrumentation - Symbolic Representation - Part 2: Extension of Basic Requirements First Edition
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Scope and field of application

This part of ISO 3511 is an extension of part 1, which is limited to identification of instrument functions.

This part of ISO 3511 includes additional symbols and is intended for the communication of measurement and control functions among instrument specialists and other engineers involved with vessels, piping, layout design and operation.

The symbols are used on piping and instrumentation diagrams and engineering line diagrams.