SEA YF-S402B Water Flow Sensor Flowmeter 0.3-6L/Min - 5-24V DC
SEA YF-S402B Water Flow Sensor Flowmeter 0.3-6L/Min - 5-24V DC - Image 2
SEA YF-S402B Water Flow Sensor Flowmeter 0.3-6L/Min - 5-24V DC - Image 3
SKU: SENS-0651
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SEA YF-S402B Water Flow Sensor Flowmeter 0.3-6L/Min - 5-24V DC

₹419.00 (Inclusive of all taxes)
Out of Stock

The SEA YF-S402B is a compact turbine-style water flow sensor designed for 5-24V DC systems, delivering a digital pulse output proportional to flow rates from 0.3 to 6 liters per minute. It is directly compatible with microcontroller digital I/O pins on platforms like Arduino, Raspberry Pi, and ESP32 for precise flow monitoring and control.

Features

  • Digital pulse frequency output (0-100Hz) directly readable by microcontroller digital pins.
  • Wide operating voltage range from 5V to 24V DC, suitable for diverse embedded systems.
  • Stainless steel shaft and rotor for enhanced durability and abrasion resistance in water applications.
  • Compact design with 6.5mm input/output diameter for easy inline installation.
  • Sealed construction with O-ring to prevent leaks, rated for up to 0.8 MPa water pressure.

Out of stock

Description

The YF-S402B flow sensor operates on a turbine principle, where liquid flow spins an internal rotor equipped with a magnet. A Hall-effect sensor detects each rotation, generating a digital pulse signal. The frequency of this pulse train is linearly proportional to the volumetric flow rate, providing a straightforward digital interface for flow measurement without requiring analog-to-digital conversion.

Constructed with a stainless steel shaft and sealed housing, the sensor is designed for reliability in continuous water flow monitoring applications. It operates within a temperature range of 0 to 80°C and can withstand water pressures up to 0.8 MPa, making it suitable for various liquid handling systems. The low 15mA current draw ensures minimal power consumption in battery-powered or low-energy designs.

Key Features

  • Generates a clean digital pulse output signal for direct microcontroller interfacing.
  • Features a robust stainless steel internal shaft for long-term mechanical reliability.
  • Integrated sealing ring design provides effective leak prevention for wet environments.
  • Wide 5-24V DC operating range accommodates both 5V logic and higher 12V/24V industrial systems.
  • Compact and lightweight form factor (57.5mm x 35mm) simplifies integration into space-constrained designs.
  • RoHS compliant construction ensures adherence to environmental safety standards.
  • Low 10mA load capability minimizes the demand on the host system's digital output.

Applications

  • Precise water flow measurement and control in point-of-sale (POS) beverage dispensers and coffee machines.
  • Monitoring water consumption and flow rates in residential and commercial water purifier and filtration systems.
  • Integrating into DIY hydroponic or aquarium systems for automated nutrient dosing and water circulation control.
  • Liquid flow verification and leak detection in compact water heaters and boiler circulation loops.
  • Educational and prototyping projects for building data-logging flow meters with Arduino or Raspberry Pi.

Technical Specifications

Model NumberYF-S402B
Flow Range0.3 - 6 L/min
Max Water Pressure≤ 0.8 MPa
Operating Voltage5 - 24 V DC
Working Current (5V)15 mA (max)
Load Capability≤ 10 mA
Output SignalDigital Pulse (Frequency: 0 - 100 Hz)
Port Diameter (Input/Output)6.5 mm (approx. 1/4 inch)
Operating Temperature0 to 80 °C
Storage Temperature-25 to 80 °C
Storage Humidity25 - 95% RH
Dimensions (L x W)57.5 mm x 35 mm
Weight35 g

Frequently Asked Questions

What is the output signal of the YF-S402B flow sensor?

The YF-S402B outputs a digital pulse signal. The frequency of the pulses varies from 0 Hz to approximately 100 Hz, directly proportional to the flow rate. This signal can be connected directly to a microcontroller's digital input pin for frequency measurement or pulse counting.

What is the operating voltage range, and can I power it with 5V from an Arduino?

Yes, the sensor operates from 5V to 24V DC, making it fully compatible with a 5V Arduino power pin. At 5V, the maximum working current is 15mA. Ensure your power supply can provide this current, especially if driving multiple sensors.

How do I calculate the flow rate from the sensor's pulse output?

The sensor has a specific pulses-per-liter (PPL) characteristic, often found in its datasheet. To calculate flow rate, measure the pulse frequency (Hz) and divide by the PPL factor. For example, if the factor is 450 PPL, a frequency of 45 Hz corresponds to a flow rate of 0.1 L/s (45 Hz / 450 PPL = 0.1 L/s). Calibration with a known volume is recommended for high accuracy.

What liquids can the YF-S402B sensor measure?

It is designed primarily for water and other low-viscosity, non-corrosive liquids. The stainless steel shaft provides good chemical resistance. It is not suitable for viscous fluids, slurries, or corrosive chemicals, as they may damage the internal turbine or seals.

What is the maximum water pressure the sensor can handle?

The YF-S402B is rated for a maximum working water pressure of 0.8 MPa (approximately 116 PSI). Do not exceed this pressure, as it may cause seal failure or damage the housing. Ensure all plumbing connections are secure and rated for your system's operating pressure.

Package Includes

  • 1 x YF-S402B Water Flow Sensor

Additional Information

Weight 0.035 kg
Dimensions 5.75 × 3.5 cm

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