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  • Velleman Water flow sensor
  • Velleman Water flow sensor

Velleman Water flow sensor

Article number: VEL-WPSE470
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In stock (Delivery timeframe:1-2 days (Belgium))

This sensor measures the volume flow rate of water in boilers, water dispensers, etc.!

When water flows through this sensor, it generates a number of pulses. The pulse signal is a square wave and by counting the pulses, you can easily calculate the volume flow rate (L/hour). Each pulse is approximately 3.33 ml. Supplied with a 30 cm cord.



  • example sketch for Arduino available
  • measures the volumetric flow rate of water in liters per hour
  • pulse signal in the form of a square wave


  • flow rate range: 1~30 L/min
  • working voltage: 4.7~15V DC
  • working current: = 10 mA (DC 5 V)
  • operating humidity: 35% ~ 90% RH (no frost)
  • water pressure: <1.75Mpa
  • operating temperature: -25 ~ 80°C
  • male thread: G3 / 4 (3/4")
  • output connector: 2.54MM-3P
  • output leads: yellow (DATA), red (VCC), black (GND)
  • lead length: 30 cm
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