| Summary: | Water meters are widely used instruments in water distribution networks and are mainly used for billing applications. In service, conditions rarely meet the stationary or mean stationary regime. In most cases, the operating conditions are characterized by a marked dynamic behavior, with a significant flow rate variation over time. In this article, the functioning of water meters under stationary and dynamic conditions is examined in more detail, highlighting the main differences between mechanical meters and meters with a different measuring principle, such as ultrasonic or electromagnetic. Some criteria and test methods for classifying the dynamic responses of water meters are also proposed.
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