BS ISO 11631:1998

1 Scope
2 Normative reference
3 Terms and definitions
4 General requirements
5 Traceability
6 Uncertainty of flow measurement
7 Conditions of use
8 Traceability group
Annex A (informative) Illustrations of linearity
Annex B (normative) Repeatability
Bibliography

Specifies methods of describing the performance of any flowmeter and indicates how flowmeters may be classified according to their traceability groups.

This International Standard applies to technical specifications and descriptions issued by manufacturers of flowmeters. It specifies methods of describing the performance of any flowmeter, for use in either closed conduits or open channels. It indicates how flowmeters may be classified according to their traceability group, and specifies how manufacturer\'s statements on traceability, quality assurance and conditions of use should be expressed, although further statements may be required for other conditions of use.

NOTE The terms and definitions given in clause3 include a large number of associated terms to encourage common usage of these terms in technical specifications.