Water Flow Sensor YF-S401 Flow meter

Water Flow Sensor YF-S401 Flow meter 0.3-6L/min 3.5mm White

$ 20.00 $ 20.00

Product Description

  • The Water Flow sensor measures the rate of a liquid flowing through it.
  • The YF-S401 water flow sensor consists of a plastic valve body, flow rotor, and hall effect sensor.
  • It is usually used at the inlet end to detect the amount of flow. When liquid flows through the sensor, a magnetic rotor will rotate
    and the rate of rotation will vary with the rate of flow.
  • The hall effect sensor will then output a pulse width signal.
  • Connect it to a microcontroller and you can monitor multiple devices such as your coffee maker, sprinkler, or anything else, and control the water flow rate to suit your needs!
  • When water flows through, the internal rotor will change its speed with different rates of flow, and the hall effect sensor outputs the corresponding pulse signal.
  • Use with laser cutters or CNC to measure if and how much water is flowing through a laser tube or CNC spindle for cooling.


  • Red: Power In
  • Black: Ground
  • Yellow: Signal Output

Package Includes:

  • 1 x Water Flow Sensor YF-S401 Flow meter 0.3-6L/min 3.5mm White
Model  YF-S401
Working Voltage DC 5V~24V
Maximum Working Current 15mA @ 5V DC
Flow Rate Range 0.3~6L/min
Outer diameter 7mm
Inner Diameter 4mm
Load Capacity ≤10mA (DC 5V)
Operating Temperature  ≤80℃
Liquid Temperature ≤120℃
Operating Humidity 35%-90%RH
Water Pressure ≤0.8MPa
Dimensions 3.4 × 5.8 cm

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