Which meter is not commonly used on water systems?

Inverse meters are not commonly used in water distribution systems primarily due to their complexity and specific application requirements. While they have certain advantages in specialized environments, such as in measuring the flow of fluids with low viscosity or in specific industrial applications, they are not standard tools for typical municipal water systems.

In contrast, positive displacement meters, volumetric meters, and even Coriolis meters serve more common functions in the measurement of water flow in distribution networks. Positive displacement meters work by measuring the actual volume of water passing through them, making them reliable for measuring low flow rates. Volumetric meters also provide accurate measurements of bulk water flow and are widely used in residential and industrial settings.

Coriolis meters, although more sophisticated and often used in process industries for measuring mass flow and density, can be used in water systems where highly accurate and instantaneous measurements are needed. However, they are less common than the other two types in standard water distribution practices due to their higher costs and more complex installation requirements.

In summary, inverse meters are not typical in water distribution systems, as the other meter types are preferred for their specific advantages and suitability in conventional water measurement applications.