![]() There are also non-mechanical designs, for example, electromagnetic and ultrasonic meters, and meters designed for special uses. Velocity-based designs include single- and multi-jet meters and turbine meters. Common displacement designs include oscillating piston and nutating disc meters. There are two common approaches to flow measurement: displacement and velocity, each making use of a variety of technologies. Outside of North America, most countries use ISO standards. In North America, standards for manufacturing water meters are set by the American Water Works Association. Several types of water meters are in common use, and may be characterized by the flow measurement method, the type of end-user, the required flow rates, and accuracy requirements. Modern meters typically can display rate-of-flow in addition to total volume. 3) or US gallons on a mechanical or electronic register. In most of the world water meters are calibrated in cubic metres (m 3) or litres, but in the United States and some other countries water meters are calibrated in cubic feet (ft. They are also used to determine flow through a particular portion of the system. ![]() Water meters measure the volume of water used by residential and commercial building units that are supplied with water by a public water supply system. Water metering is the practice of measuring water use. ( August 2009) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
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