scope:

This Standard applies to ultrasonic flowmeters that base their operation on the measurement of transit time of acoustic signals. This Standard concerns the volume flow-rate measurement of a single-phase liquid with steady flow or flow varying only slowly with time in a completely filled closed conduit.

Purpose

This Standard provides

(a) a description of the operating principles employed by the transit-time ultrasonic flowmeters

(b) a guideline to expected performance characteristics of transit-time ultrasonic flowmeters

(c) a description of calibration, verification, and diagnostic procedures

(d) a description of potential uncertainty sources and their reduction

(e) a common set of terminology, symbols, definitions, and specifications