Symbolic representation for process measurement control functions and instrumentation - Specification for detailed symbols for instrument interconnection diagrams Ingestion-build-266356 7 The basic principles

7 The basic principles

• Requirements for combining functions into multifunction controls

to describe methods of measurement and to standardize operating conditions and interpretation of results

This part of IEC 60721 classifies the groups of environmental parameters and their severities to which a product is subjected while being transported and handled

or to chemicals for 24 h and

Symbolic representation for process measurement control functions and instrumentation - Specification for detailed symbols for instrument interconnection diagrams Ingestion-build-266356 7 The basic principles1 Scope and field of application This part of BS 1646 specifies instrument symbols for use on interconnection diagrams used for the design, installation, and maintenance of process measurement and control systems. These detailed symbols are not normally intended for drawings that use the functional symbols given in BS 16461 and BS 16462. However, the symbols specified in this part of BS 1646 show, by detailing the components, the external connections