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Symbolic representation for process measurement control functions and instrumentation - Specification for basic symbols for process computer, interface and shared display/control functions Ingestion-build-202139 BS EN 50131-4 is intended1 Scope and field of application This Part of BS 1646 specifies symbols for the representation of process computer and shared control functions in the field of process measurement and control. The symbols established in this part have been developed to be used in conjunction with the symbols devised in BS 16461 and BS 16462 and are supplementary. They are intended to provide a means to illustrate process computer and or shared display control