The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S401 water flow sensor 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!

    A 6 mm hose is recommended
    Avoid unit contact with corrosive chemicals
    The unit must be installed vertically, tilted no more than 5 degrees
    Liquid temperature should be less than 120 C to avoid damage to unit


Specification

    Inner Diameter: 4 mm
    Outside diameter: 7 mm
    Proof Water Pressure: <0.8 MPa
    Water Flow Range: 0.3-6 L/min
    Voltage Range: 5~12 V
    Operating Current: 15 mA (DC 5V)
    Insulation Resistance: >100 MΩ
    Accuracy: ±5% (0.3-3L/min)
    The Output Pulse High Level: >4.5 VDC (DC input voltage 5 V)
    The Output Pulse Low Level: <0.5 VDC (DC input voltage 5 V)
    Output Pulse Duty Ratio: 50% ± 10%
    Water-flow Formula: 1L = 5880 square waves
    Working Humidity Range: 35% ~ 90% RH (no frost)
    Dimension: 58*35*26 mm/2.28*1.37*1.02 inches
    Weight: 30g