Smart Home Supplier

  • YF-S401 Water Flow Sensor
  • YF-S401 Water Flow Sensor
  • YF-S401 Water Flow Sensor
  • YF-S401 Water Flow Sensor

Water Flow Sensor


In stock

This water flow sensor consists of a PVC body, a built in water rotor, and a hall-effect sensor. When water flows through the rotor, the rotor rolls and produces an output pulse signal, this signal then changes with different rates of flow. This sensor is suitable to detect fluid flow in water dispensers, greenhouse irrigation systems or coffee machines.



  • Compact, Easy to Install
  • High Sealing Performance
  • High Quality Hall Effect Sensor
  • RoHS Compliant



  • Model: YF-S401
  • Input/Output Aperture: 6mm
  • Mini. Working Voltage: DC 4.5V
  • Max. Working Current: 15mA (DC 5V)
  • Working Voltage: DC 5V~24V
  • Water resistant 0.35MPa
  • Flow Rate Range: 0.3~ 6L/min
  • Load Capacity: ≤10mA (DC 5V)
  • Operating Temperature: ≤80°C
  • Operating Humidity: 35%~90% RH
  • Water Pressure: ≤0.8MPa
  • Internal diameter: 1.2mm;
  • Error: +/-0.2L/min;
  • Output pulse duty cycle 50% ± 10%
  • Output pulse high level > DC 4.7V (input voltage DC 5V)
  • Flow pulse characteristics F = (98 * Q) ± 2% Q = L / MIN


Connector Details

  • Red : IN Positive
  • Yellow : OUT Signal Output
  • Black : GND Negative
Weight 25 g
Dimensions 6 × 4 × 3 cm

Header pins soldered on

Not Soldered

Header pins not soldered onto board

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