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 in-tended for the communication of measurement and control functions among instrument specialists and other engineers in-volved with vessels, piping, layout design and operation.
The symbols are used on piping and instrumentation diagrams and engineering line diagrams.
IS 12754 Pt.2-1989 history
1990IS 12754 Pt.2-1989 Process measurement control functions and instrumentation—Extensions to the basic requirements for symbolic representation Part 2