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YF-S201 Water Flow Sensor

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Available on backorder

205.85 (Including tax)

Discount per Bulk Quantity

5 - 105%195.56 (Including tax)
11 - 208%189.38 (Including tax)
21 - 4010%185.27 (Including tax)
41 - 10012%181.15 (Including tax)
  • Estimated delivery time 2-4 days
  • (Subject to stock Availability)

Product details

This YF-S201 1/2 inch Water flow sensor consists of a black plastic valve body, a water rotor and a hall effect sensor. 1-30 Litre/min Water can flow through this sensor. This YF-S201 is placed in line with water and its pinwheel sensor detects how much liquid has flowed through it. With every pinwheel revolution magnetic hall effect sensor generate an electrical pulse which is fed to the controller and thus controller is able to detect how much liquid is flowing through the sensor at any point of time. The hall effect sensor is sealed from the liquid pipe and thus remains protected from the water. The Electrical pulse generated by the sensor is approximately equal to 2.25 milliliters. So by counting the number of pulse we can easily calculate the amount of water flowing through the sensor. 

Type Flowmeter Control Switch (YF-S201)
Voltage (max) 5V-18V DC
Maximum operating Current 15 mA @ 5VDC
Flow Rate Range 1-30 L/min
Load capacity ≤ 10 mA (DC 5V)
Maximum Water Pressure 2 MPa
Accuracy ±10%
Pulses/Litre 450 
Intake/Outlet Diameter 11 mm 
Outer Diameter  20 mm 
Output Rise/Fall Time 0.4 µsec
Output Duty Cycle 50% +-10%
Dimension(LxWxH) 63x36x35 mm 
Country of Origin China



The YF-S201 comes with three wires: Red/VCC (5V-18V) DC Input, Black/GND and Yellow which is for the Pulse Output. Connect the Red wire with the VCC of your controller, Black with Ground and Yellow wire with any digital pin which can also handle the interrupts. As soon as the liquid start flowing through the sensor, it generates digital pulse proportionally. With the help of counters and interrupts you can measure the liquid flow rate. 

      Additional information

      Weight 47450 kg

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