Which type of meter is most commonly used on small diameter domestic services?

The most commonly used meter on small diameter domestic services is the positive displacement meter. This type of meter is designed to measure the volume of water flowing through it by utilizing a mechanical mechanism. It operates by capturing water in a series of chambers that fill and empty, causing a measuring element to move and provide a reading based on the volume of water that has passed through.

Positive displacement meters are favored for residential applications because they are accurate at low flow rates, which is typical in domestic use, and they can handle fluctuations in flow effectively. Their reliability and ease of use make them a standard choice for measuring water consumption in households.

The other meter types mentioned have their specific applications but are not as widely used for small diameter domestic services. Electromagnetic meters, for instance, require conductive water and are more suited for larger systems. Mutating disc meters, while effective, tend to be less common for residential applications due to their design and cost. Ultrasonic meters are advanced and useful for some applications but are generally employed in larger scale or specific industrial contexts due to their higher price point and sensitivity requirements.