How is a nutating-disk water meter classified?

A nutating-disk water meter is classified as a displacement type meter because it operates on the principle of measuring the volume of water flowing through the meter by displacing a disk. The design includes a disk that pivots or 'nutates' in response to water flow, causing it to turn and register the amount of water passing through the meter. This type of meter captures the mechanical movement related to the volume of water and translates that movement into readable output, making it a staple in residential and commercial water measurement.

The classification of nutating-disk meters as displacement types emphasizes their functionality in accurately measuring water volume based on physical displacement, rather than electronic measurement methods or other measurement principles used in different types of meters. This classification is significant for understanding the design and operational characteristics that define how these meters measure water consumption.