BS 1646-4:1984
Symbolic representation for process measurement control functions and instrumentation, Specification for basic symbols for process computer, interface and shared display/control functions
Specifies symbols to illustrate process computer and/or shared display/control functions in process measurement and control, e.g. on process flow diagrams. The symbols may be used in conjuction with the symbols given in Part 1 of BS 1646 but they do not provide a means of illustrating specific instruments or parts thereof.
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