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1/2 inch Water Flow Sensor - YF-S201 (High Quality)

  1. The simple and compact module
  2. Working Voltage: 5 to 18V DC (min tested working voltage 4.5V)
  3. Max current draw: 15mA @ 5V
  4. Working Flow Rate: 1 to 30 Liters/Minute
  5. Maximum water pressure: 2.0 MPa
  6. Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min)

270.00 228.81+18% GST

In stock

SKU 04AA012 Categories ,

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1/2 inch Water Flow Sensor – YF-S201

This is YF-S201 Water Flow Measurement Sensor with 1-30Leter/min Flow Rate. The water flow sensor consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rates of flow. The hall-effect sensor outputs the corresponding pulse signal.

This one is suitable to detect flow in a water dispenser or coffee machine. We have a comprehensive line of water flow sensors in different diameters. Check them out to find the one that meets your needs most. (find out a wide range of Sensor at

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, it’s great for basic measurement tasks!


Red wire+5V
Black wireGND
Yellow wirePWM output


  1. Compact
  2. Easy to Install
  3. High Sealing Performance
  4. High-Quality Hall Effect Sensor
  5. RoHS Compliant


  1. Measure liquid/water flow for your solar
  2. water conservation systems
  3. storage tanks, water recycling home applications,
  4. irrigation systems


1 x 1/2 inch Water Flow Sensor – YF-S201


Model YF-S201
Working Voltage (V) 5 ~ 18
Max current draw 15mA @ 5V
Working Flow Rate (Liters/Minute) 1 ~ 30
Operating Temperature range (℃) -25 ~ +80
Operating Humidity Range 35% – 80% RH
Accuracy ±10%
Maximum water pressure 2.0 MPa
Output duty cycle 50% +-10%
Output rise time (µsec) 0.04
Pulses per Liter 450
Output fall time (µsec) 0.18
Outer diameter (mm) 20
Intake diameter (mm) 11
Outlet diameter (mm) 11
Length (mm) 62.5
Width (mm) 36
Height (mm) 35
Weight (gm) 50


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