BS 1646-3:1984
Current
The latest, up-to-date edition.
Symbolic representation for process measurement control functions and instrumentation Specification for detailed symbols for instrument interconnection diagrams
Hardcopy , PDF
English
31-01-1984
Foreword
Committees responsible
Specification
0 Introduction
1 Scope and field of application
2 Definitions
3 Symbols
Annex
Examples of the use of graphical symbols
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.
| Committee |
TPR/1
|
| DevelopmentNote |
Supersedes 79/23678 DC. (06/2005) Reviewed and confirmed by BSI, December 2011. (11/2011)
|
| DocumentType |
Standard
|
| Pages |
26
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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 1646-1 and BS 1646-2. However, the symbols specified in this part of BS 1646 show, by detailing the components, the external connections between units of equipment.
Information on the internal connections in units is not normally included, but references to the appropriate circuit or wiring diagrams may be provided.
When an instrument is composed of more than one functional part, the different symbols may be combined, for example, recorder controller.
The dimensions of the symbols are unspecified, provided the ratio of the side lengths is maintained according to this part of BS 16461).
If not otherwise stated, contact symbols should be shown open.
The diagrams may employ single line or multi-line representation and may be combined with, or replaced by tables, providing clarity is maintained.
For further assistance see IEC 113-5, Preparation of interconnection diagrams and tables.
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