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Water Flow Sensor YF-S201

SKU: SV4QZBV469
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4.9 (98 reviews)
The YF-S201 Water Flow Sensor is a Hall-effect-based liquid flow measurement sensor designed to measure the flow rate and total volume of water passing through a pipeline. The sensor consists of a plastic valve body, internal water rotor, permanent magnet, and Hall-effect sensor. When water flows through the sensor, the rotor rotates and the Hall-effect sensor generates electrical pulses proportional...
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The YF-S201 Water Flow Sensor is a Hall-effect-based liquid flow measurement sensor designed to measure the flow rate and total volume of water passing through a pipeline. The sensor consists of a plastic valve body, internal water rotor, permanent magnet, and Hall-effect sensor. When water flows through the sensor, the rotor rotates and the Hall-effect sensor generates electrical pulses proportional to the flow rate.

The YF-S201 provides a digital pulse output that can be counted by a microcontroller to calculate instantaneous water flow rate and accumulated water volume. Its typical measurement range is 1 to 30 litres per minute, and a commonly specified calibration relationship is approximately 450 pulses per litre, equivalent to a frequency relation of F = 7.5 × Q, where Q is the flow rate in litres per minute.

With its G1/2-inch threaded connections, compact construction, simple 3-wire interface, and compatibility with Arduino, ESP32, STM32, Raspberry Pi, PIC, AVR, and other controllers, the YF-S201 is widely used in water monitoring systems, irrigation controllers, water dispensers, smart tanks, filtration systems, and IoT-based water management projects.

Key Features

  • Hall-effect-based water flow measurement
  • Measures both water flow rate and accumulated volume
  • Flow measurement range of 1–30 L/min
  • Digital pulse output proportional to water flow
  • Approximately 450 pulses per litre under typical calibration
  • Simple three-wire electrical interface
  • Integrated water rotor and Hall-effect sensor
  • Non-contact magnetic sensing mechanism
  • Low operating current
  • Wide operating voltage range
  • G1/2-inch threaded inlet and outlet connections
  • Compact and lightweight construction
  • Easy installation in water pipelines
  • Suitable for real-time flow monitoring
  • Easy interfacing with microcontrollers
  • Ideal for water management and automation systems

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Sensor Type: Hall-Effect Water Flow Sensor
Model: YF-S201
Measurement Type: Water Flow Rate and Accumulated Volume
Sensing Principle: Turbine Rotor with Hall-Effect Pulse Detection
Flow Rate Range: 1–30 L/min
Working Voltage: 5V to 24V DC on commonly specified versions
Maximum Current: Approximately 15mA at 5V
Output Type: Digital Pulse Signal
Typical Pulse Frequency Relationship: F = 7.5 × Q
Q Unit: Litres per Minute
Typical Pulses Per Litre: Approximately 450 Pulses
Typical Accuracy: ±5%, depending on flow range and sensor version
Output Duty Cycle: Approximately 50% ±10%
Maximum Operating Pressure: Approximately 1.2MPa on commonly specified YF-S201 versions
Operating Temperature: 0°C to +80°C
Operating Humidity: 35% to 90% RH
Storage Temperature: -25°C to +80°C
Pipe Connection: G1/2 Inch Male Thread
Sensor Body Material: Plastic
Cable Type: 3-Wire Cable
Typical Cable Length: Approximately 15cm
Typical Weight: Approximately 43g
Compatibility: Arduino UNO, Nano, Mega, ESP32, STM32, Raspberry Pi, PIC, AVR, RP2040 and other pulse-counting controllers.

Additional Resources

Water Flow Sensor.PDF

FAQ

1. What is the YF-S201 Water Flow Sensor used for?

The YF-S201 is used to measure water flow rate and total water volume in applications such as irrigation systems, water dispensers, smart water meters, filtration systems, tank monitoring, and IoT water management projects.

2. How does the YF-S201 Water Flow Sensor work?

Water passing through the sensor rotates an internal turbine rotor. A magnet attached to the rotor activates the Hall-effect sensor, producing electrical pulses that can be counted to calculate water flow rate and total volume.

3. Is the YF-S201 compatible with Arduino and ESP32?

Yes. The sensor can be used with Arduino, ESP32, STM32, Raspberry Pi, PIC, AVR, RP2040, and other controllers capable of reading and counting digital pulse signals.

4. What is the measurement range of the YF-S201?

The typical flow measurement range of the YF-S201 is 1 to 30 litres per minute. Measurement accuracy can vary depending on flow conditions, installation, water pressure, and sensor calibration.

5. Can the YF-S201 measure the total amount of water used?

Yes. By counting the output pulses over time, a microcontroller can calculate the total volume of water that has passed through the sensor. A typical calibration value is approximately 450 pulses per litre, although calibration is recommended for precision applications.