Paddlewheel flow meters have a paddle wheel that is perpendicular to the flow path. The rotor axis is positioned to limit contact between the paddles and the flowing media. There are many different types of paddlewheel flow meters. Examples include gas flow meters, air flow meters, liquid flow meters, and water flow meters. A gas flow meter is used to determine the flow of a moving gas in an enclosed pipe or passage. An air flow meter is used to measure airflow rate by measuring only a part of the entire flow. A liquid flow meter is used to determine the flow of quantity of a moving fluid. A water flow meter is designed to measure the flow of water. Paddlewheel flow meters carry physical, media and operating specifications, and differ in terms of output options and features.

