BS 1646-4:1984
Current
The latest, up-to-date edition.
Symbolic representation for process measurement control functions and instrumentation Specification for basic symbols for process computer, interface and shared display/control functions
Hardcopy , PDF
English
30-04-1984
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Foreword
Committees responsible
Specification
0 Introduction
1 Scope and field of application
2 Definitions
3 Basic symbols
4 Examples of the use of symbols
Figures
1 Basic symbol for computer based functions
2 Basic symbol for 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.
| Committee |
TPR/1
|
| DevelopmentNote |
Supersedes 82/31347 DC. (06/2005) Reviewed and confirmed by BSI, February 2012. (01/2012)
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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 1646-1 and BS 1646-2 and are supplementary.
They are intended to provide a means to illustrate process computer and/or shared display/control functions in the field of process measurement and control and may be used separately or combined with the symbols of BS 1646-1 and BS 1646-2. They will enable users to show and identify in a simple form the functions of instruments, the process computer and shared display/control functions or any combination of these.
It is permissible to use the basic symbol for computer based functions (see 3.1) throughout for any software based digital system. This is not intended to preclude the use of the basic symbol for shared display/control functions (see 3.2) if the user considers this to be appropriate.
The symbols are intentionally limited to the identification on process flow diagrams, etc and do not provide a means of illustrating specific instruments or parts thereof.
The letter code for function identification is given in the Tables of BS 1646-1 and BS 1646-2.
The application methods are shown in the examples.
NOTE The titles of the publications referred to in this standard are listed on Inside back cover.
| Standards | Relationship |
| ISO 3511-4:1985 | Identical |
| BS EN 61082-2:1994 | Preparation of documents used in electrotechnology Function-oriented diagrams |
| BS 1646-2:1983 | Symbolic representation for process measurement control functions and instrumentation Specification for additional basic requirements |
| BS 1646-3:1984 | Symbolic representation for process measurement control functions and instrumentation Specification for detailed symbols for instrument interconnection diagrams |
| BS 3939:1966 | Graphic symbols for electrical and electronic diagrams |
| BS 1646-1:1979 | Symbolic representation for process measurement control functions and instrumentation Basic requirements |
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