Measurement of fluid flow in closed conduits. Ultrasonic transit-time meters for liquid1 Scope 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

it is often unclear how a product’s reported acoustic characteristics are to be applied to determine its acoustic impact in a furnished room

This standard takes account of intended use

BS EN 10147

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BS EN 62391-1-1 specifies the requirements for inspection which results in standardizing the quality of these Polymeric thermistors

The ASE level is measured by synchronously measuring the power on an optical spectrum analyzer (OSA) during the optical pulse off period

and information to be supplied by the manufacturer

It is recognised that testing and analysis also occur during the product development process

Distribution is only for information

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and describes how the charges produced give rise to discharges which may cause ignitions or electric shocks

Efficiently managed community systems have far-reaching benefits for all stakeholders