BS 1646-3:1984 Symbolic representation for process measurement control functions and instrumentation - Specification for detailed symbols for instrument interconnection diagrams
Depicts, by detailing the components, the external connections between units of equipment. These symbols are intended for use at all stages of design, manufacture, installation and operation but are not intended to replace graphic symbols for electrical equipment.
BS 1646-3:1984 history
0000 BS 1646-3:1984(2011)
1984BS 1646-3:1984 Symbolic representation for process measurement control functions and instrumentation - Specification for detailed symbols for instrument interconnection diagrams