BS ISO 12242:2012

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of measurement
5 Performance requirements
6 Uncertainty in measurement
7 Installation
8 Test and calibration
9 Performance testing
10 Meter characteristics
11 Operational practice
Annex A (normative) - Temperature and pressure correction
Annex B (informative) - Effect of a change of roughness
Annex C (informative) - Example of uncertainty calculations
Annex D (informative) - Documents
Bibliography

Describes requirements and recommendations for ultrasonic liquid flowmeters, which utilize the transit time of ultrasonic signals to measure the flow of single-phase homogenous liquids in closed conduits.

This International Standard specifies requirements and recommendations for ultrasonic liquid flowmeters, which utilize the transit time of ultrasonic signals to measure the flow of single-phase homogenous liquids in closed conduits.

There are no limits on the minimum or maximum sizes of the meter.

This International Standard specifies performance, calibration and output characteristics of ultrasonic meters (USMs) for liquid flow measurement and deals with installation conditions. It covers installation with and without a dedicated proving (calibration) system. It covers both in-line and clamp-on transducers (used in configurations in which the beam is non-refracted and in those in which it is refracted). Included are both meters incorporating meter bodies and meters with field-mounted transducers.