What is a positive displacement meter?

A positive displacement meter is defined as a type of flow meter that uses fluid to mechanically displace components within the meter itself. This design allows the meter to measure the volume of fluid that passes through it by capturing discrete volumes of fluid and counting them. Each time the fluid displaces a fixed volume within the meter, it generates a pulsation which can be counted, enabling accurate total volume measurements.

This type of meter is particularly valued for its accuracy and reliability across various flow conditions, making it suitable for low to moderate flow rates in various applications. The mechanical components are crucial since they directly relate to the meter's operation, distinguishing it from other types of meters that might measure flow through different principles, such as pressure drop or average flow rates.