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Water Flow Sensor YFS401


  1. Operating Voltage: 5-12VDC
  2. Operating Current: 15mA
  3. Insulation Resistance >100MOhm
  4. Nozzle Size: 1/8″
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The Water Flow Sensor YFS401 measures the rate of a liquid flowing through it. The  YFS401  consists of a plastic valve body, flow rotor, and hall effect sensor. It is usually used at the inlet end to detect the amount of flow. When liquid flows through the sensor, a magnetic rotor will rotate and the rate of rotation will vary with the rate of flow. The hall effect sensor will then output a pulse width signal. Connect it to a microcontroller and you can monitor multiple devices such as your coffee maker, sprinkler or anything else, and control the water flow rate to suit your needs.

Features of Water Flow Sensor YFS401 

  1. Analog Sensor
  2. Accuracy Up-to 5%
  3. Water Proof Sensor
  4. Standard 1/8″ Nozzle Size
  5. Max. Supported Water Flow: 6L/Min


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