Editing Flow measurement (section)

===Paddle wheel meter===
{{Unreferenced section|date=December 2024}}
[[File:TK Series Paddle Wheel Assembly.jpg|alt=Truflo TK Series Paddle Wheel Flow Meter|thumb|The paddle wheel assembly generates a flow reading from the fluid flowing through the pipe instigating the spinning of the paddlewheel. Magnets in the paddle spin past the sensor. The electrical pulses produced are proportional to the rate of flow.]]
Paddle wheel flowmeters (also known as [[Pelton wheel]] sensors) consist of three primary components: the paddle wheel sensor, the pipe fitting and the display/controller. The paddle wheel sensor consists of a freely rotating wheel/impeller with embedded magnets which are perpendicular to the flow and will rotate when inserted in the flowing medium. As the magnets in the blades spin past the sensor, the paddle wheel meter generates a frequency and voltage signal which is proportional to the flow rate. The faster the flow the higher the frequency and the voltage output.

The paddle wheel meter is designed to be inserted into a pipe fitting, either 'in-line' or insertion style. Similarly to turbine meters, the paddle wheel meter requires a minimum run of straight pipe before and after the sensor.

Flow displays and controllers are used to receive the signal from the paddle wheel meter and convert it into actual flow rate or total flow values.