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Hall Effect Water Flow Sensor YF-S201

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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.

The sensor comes with three wires: red (5-24VDC power), black (ground) and yellow (Hall effect pulse output). By counting the pulses from the output of the sensor, you can easily calculate water flow. Each pulse is approximately 2.25 milliliters. Note this isn't a precision sensor, and the pulse rate does vary a bit depending on the flow rate, fluid pressure and sensor orientation. It will need careful calibration if better than 10% precision is required. However, its great for basic measurement tasks!


  1. Model : YF-S201
  2. Operating Voltage : 5V ~ 24V DC
  3. Min. Working Voltage : 4.5V DC
  4. Sensor Type : Hall Effect
  5. Current Requirement : 15mA @ 5V
  6. Operating Temperature Range : -25°C ~ 80°C
  7. Operating Humidity Range : 35% ~ 90% RH
  8. Water Pressure : ≤ 1.75MPa
  9. Flow Rate : 1 – 30 L/min
  10. Cable Length : 15cm
  11. Connection Thread : 1/2″
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