Kamen vortex flow sensor, is a use of liquid flow impact magnetic core rotation, Hall chip sensing magnetic pole change, so as to output a certain frequency signal. The water flow rate is linearly related to the output frequency. It has a wide range of flow rates (designed for 2-30 liters/minute), stable performance, high temperature resistance up to 85C and water pressure resistance up to 18 kg, and low cost. Typical applications include the detection of forced-air water heaters, gas wall-hung boilers to monitor the flow rate, thus realizing the effect of thermostat, and other need to detect the flow of liquid in the equipment can be used, such as large-scale water dispensers, medical equipment, as well as coffee makers, dishwashers and so on.