What type of water meter is a nutating-disk meter classified as?

A nutating-disk water meter is classified as a displacement type meter because it measures the volume of water that passes through it by displacing a known volume with each rotation of the meter's internal disk. As water flows into the meter, the movement of the disk causes it to nutate, or wobble, which is a key feature that allows the meter to register the amount of water flowing through it accurately.

In this type of meter, the water first fills up a measuring chamber, which then causes the disk to rotate. The total volume of water can be calculated based on the number of rotations of the disk, thus providing an accurate measurement of water consumption. This method of measurement is effective for domestic and commercial water usage where precise volume measurement is essential.

The other types, such as velocity meters, measure flow rate rather than total volume, while smart meters incorporate digital technology for data transmission and monitoring, and magnetic meters utilize the principles of electromagnetism. However, since the nutating-disk meter focuses specifically on displacement to gauge the total volume of water passing through, it is distinctly categorized under displacement type meters.