New Hall-Effect-Water-Flow-Meter

700.00 650.00

For Order Confirmation go to or Call at 0309-9984946

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!

We have as example Arduino sketch that can be used to quickly test the sensor, it will calculate the approximate flow of water in liters/hour.

The pulse signal is a simple square wave so its quite easy to log and convert into liters per minute using the following formula.

Pulse frequency (Hz) / 7.5 = flow rate in L/min.


Max current draw: 15mA @ 5V

Output Type: 5V TTL

Working Flow Rate: 1 to 30 Liters/Minute

Working Temperature range: -25 to +80℃

Working Humidity Range: 35%-80% RH

Accuracy: ±10%

Maximum water pressure: 2.0 MPa

Output duty cycle: 50% +-10%

Output rise time: 0.04us

Output fall time: 0.18us

Model: YF-S201

Sensor Type: Hall effect

Working Voltage: 5 to 18V DC (min tested working voltage 4.5V)

Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min)

Pulses per Liter: 450

Durability: minimum 300,000 cycles

Cable length: 15cm

Pulses per Liter: 450

Durability: minimum 300,000 cycles

Cable length: 15cm

1/2″ nominal pipe connections, 0.78″ outer diameter, 1/2″ of thread

Size: 2.5″ x 1.4″ x 1.4″

SKU: wfm1 Category:


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