Water flow sensor YF-S201 diameter 1/2 inch

The 1/2 inch water flow sensor with Hall effect sensor is an ideal solution for automated water consumption monitoring. It generates pulse signals proportional to the water flow rate, making it perfect for integration with microcontrollers, PLCs, and smart control systems.

If you are looking to buy a water flow sensor 1/2", check the price, read reviews, or select reliable radio components — this model offers stable operation, high temperature resistance, and easy 3-wire connection.

Operating Principle

The sensor consists of:

• Plastic valve body with 1/2" threaded fittings

• Internal water rotor

• Built-in Hall effect sensor

When water flows through the sensor, the rotor spins at a speed proportional to the flow rate. The Hall sensor detects each rotation and outputs a pulse signal with corresponding frequency.

Wiring

• Black – GND

• Red – VCC (3.5–24V)

• Yellow – Signal output (pulse)

Technical Specifications

• Thread Diameter: 1/2 inch (inlet/outlet)

• Operating Voltage: 3.5–24V DC

• Maximum Current: 15 mA (at 5V)

• Flow Range: 1–30 L/min

• Working Pressure: up to 1.75 MPa

• Liquid Temperature: up to 120°C

• Ambient Temperature: 0–80°C

• Working Humidity: 35–90%

• Dimensions: 56 × 35 × 35 mm

⚠ Avoid strong impacts and chemical corrosion.

Applications

• Smart water meters

• Automatic irrigation systems

• Water dispensers

• Industrial fluid monitoring

• DIY Arduino and microcontroller projects

Reliable and easy to integrate, this sensor is widely used by engineers and hobbyists for accurate flow measurement.