Which type of meter is classified as a positive displacement meter?

Study for the Water Treatment Class E Test. Prepare with flashcards and multiple choice questions, each question features hints and explanations. Get ready for your certification exam!

A positive displacement meter is designed to measure the volume of water passing through it by capturing discrete amounts of flow in a chamber with each revolution or movement. The nutating disc meter operates on this principle, utilizing a disc that tilts and moves within a measuring chamber. As water flows through the chamber, it causes the disc to nutate, or wobble, which displaces a known volume of water with each cycle. This mechanism allows for accurate volumetric measurement, making it suitable for a wide range of flow rates.

In contrast, the other meters listed function based on different principles. The Venturi meter relies on the principle of fluid dynamics and the Venturi effect, where a fluid's speed increases while its pressure decreases in a constricted section of pipe. The turbine meter employs a rotating turbine that spins in response to the flow of water, translating the rotational speed into a volumetric flow rate. Lastly, the propeller meter uses a propeller that spins with the flow, with the speed of rotation corresponding to the volume of flow. While these meters are effective for flow measurement, they do not classify as positive displacement meters, as their operation does not involve the direct capturing of discrete volumes in a chamber.

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