Water flow sensor consists of a plastic valve body, a water rotor, and a hall effect sensor - when water flows through, the internal rotator will change its speed with different rate of flow and hall effect sensor outputs the corresponding pulse signal. Use with laser cutters or CNC to measure if and how much water is flowing through laser tube or CNC spindle for cooling.


Working Voltage: DC 5V~24V
Maximum Working Current: 15mA @ 5V DC
Flow Rate Range: 0.3~6L/min
Connection: 6mm (external diameter)
Inlet Water Pipe Diameter: 2.5-4mm
Load Capacity: ≤10mA (DC 5V)
Operating Temperature: ≤80℃
Liquid Temperature: ≤120℃
Operating Humidity: 35%~90%RH
Water Pressure: ≤2.0MPa
Storage Temperature: -25~+ 80℃
Storage Humidity: 25%~95%RH


Red: Power In
Black: Ground
Yellow: Signal Output

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Water Flow Sensor YF-S401

  • Product Code: Water Flow Sensor: YF-S401
  • Availability: In Stock
  • $5.95 USD

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Tags: flow sensor, hall effect, arduino, water, 0.3l, 6l/min, sensor, laser cutter, cnc sensors yf-s401