2 Inch Stainless Steel Hall Flowmeter — Water Flow Sensor / Liquid Control Switch, Energy Saving

A 2-inch Hall-effect flow sensor built with a brass valve body and a water flow rotor assembly housed in stainless steel. It is intended for mounting at the water inlet of a water heater to continuously measure water flow. As water passes through the rotor assembly, a magnetic rotor spins; its rotational speed varies with the flow rate.

The Hall sensor detects the rotor movement and produces corresponding pulse signals that are sent back to the controller. The controller uses those pulses to determine the flow magnitude and regulate the system accordingly.