Water Flow Sensor

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  • YF-S201 Water Flow Sensor
  • Operating Voltage: 4.5V to 18V DC
  • Output type: 5V TTL
  • Maximum current draw: 15mA at 5V
  • The sensor used: Hall Effect
  • Working Flow rate: 1 to 30 Liters/Minute
  • Accuracy: ±10%
  • Pulses per Liter: 450
  • water pressure < 1.75MPa
  • Maximum water pressure: 2.0 MPa
  • Output duty cycle: 50% -10%
  • Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min)
  • This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There’s an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.


  • YF-S201 Water Flow Sensor
  • YF-S201 is a water flow measurement sensor with high-grade quality sealing property. It works on the Hall effect principle and with a flow rate range of 1~30L/min. The module has three pins: Power, Ground, and the Analog output. YF-S201 consumes very little current and can work with an allowing pressure of ≤1.75MPa.
  • The water flow sensor is mainly composed of a plastic valve body, a water flow rotor assembly and a Hall sensor.
  • It is installed at the water inlet end of the water heater to detect the influent flow rate as it passes through the water flow rotor assembly.
  • The magnetic rotor rotates and the rotational speed changes with the flow rate change.
  • The Hall sensor outputs a corresponding pulse signal and feeds it back to the controller.
  • The controller determines the magnitude of the water flow and performs regulation.

Applications of YF – S201

  • Agriculture
  • Food processing
  • Coffee/Tea makers
  • Water Management
  • Mining Industry