YF-S201 Water Flow Sensor – G1/2" Interface, 1-30L/min Flow Rate, Hall Effect Liquid Flowmeter for Arduino & Liquid Management

Product Description The YF-S201 is a high-reliability water flow sensor designed for precise liquid measurement in automated dispensing, water heaters, and smart irrigation systems. It features a standard G1/2" threaded interface that easily integrates into domestic plumbing and industrial piping. Inside the sensor is a high-grade plastic valve body containing a water rotor and a Hall-effect magnetic sensor. As water passes through the rotor, it spins at a rate proportional to the flow velocity, causing the Hall sensor to output a corresponding pulse signal (square wave). This digital output is directly compatible with microcontrollers like Arduino, ESP32, and Raspberry Pi, making it an essential tool for smart water management and monitoring applications.

Key Features

• Hall Effect Sensing: Utilizes non-contact magnetic sensing to ensure long-term durability and resistance to wear and tear.

• Standard G1/2" Threads: Features universal half-inch pipe threading for easy, leak-free installation into standard water lines.

• Compact and Robust Design: Built with high-quality nylon and glass fiber, ensuring mechanical strength and chemical resistance to common fluids.

• Digital Pulse Output: Provides a clean square-wave signal where the frequency varies linearly with the flow rate for simple decoding.

• Wide Operating Voltage: Capable of operating from 5V up to 18V, allowing for versatility across different power supply environments.

Technical Details

• Working Principle: When water flows through the rotor assembly, the magnetic rotor rotates and the Hall-effect sensor outputs a pulse signal for every revolution.

• Flow Pulse Characteristics: The frequency (Hz) follows the formula F = 7.5 * Q, where Q is the flow rate in liters per minute (L/min).

• High Pressure Rating: The reinforced plastic structure is tested to withstand water pressures up to 1.75 MPa without leaking or bursting.

• Low Power Consumption: Draws less than 15mA at 5V DC, making it suitable for continuous monitoring in battery-powered IoT nodes.

• Storage Environment: Optimized for stability in temperatures between -25°C and +80°C and humidity levels up to 95%.

• Output Waveform: Produces a 5V TTL compatible square wave (when powered at 5V) with a stable 50% duty cycle.

• Insulation Resistance: Features high-quality internal potting to ensure insulation resistance greater than 100MΩ between the leads and the housing.

• Wiring Pinout: Standard 3-wire interface: Red (VCC), Black (GND), and Yellow (Pulse Signal).

• Rotor Material: High-strength plastic rotor with integrated stainless steel axis for reduced friction and improved lifespan.

• Directional Flow: Features an arrow molded into the housing to indicate the required direction of water flow for accurate readings.

• Internal Seal: Equipped with high-quality rubber O-rings to prevent water ingress into the internal electronic compartment.

• Update Rate: Near-instantaneous pulse response allows for high-resolution measurement of even small water volumes.

• Lead Wire: Comes with high-quality 24AWG flexible wiring, typically 15cm in length, for easy connection to headers.

• Mounting Versatility: Can be installed at any angle, provided the flow direction matches the indicator arrow.

• Safety Standards: Manufactured using non-toxic materials suitable for use in domestic water dispensing systems.