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The YF-S401 Water Flow Sensor Flowmeter is an ultra-compact, high-precision liquid measuring device tailored for low-flow rate applications ranging from $0.3\text{ L/min}$ to $6.0\text{ L/min}$. Unlike standard industrial flowmeters designed for high-volume piping, the YF-S401 is specialized for small liquid lines, such as those found in beverage dispensers, water purifiers, medical dosing equipment, and laboratory test rigs.

At the core of the sensor is a lightweight internal water wheel rotor with an embedded permanent magnet. As fluid flows through the $3.5\text{mm}$ nozzle chamber, it spins the rotor at a speed proportional to the volumetric flow rate. An integrated magnetic Hall-effect sensor detects each rotation and outputs a clean, 5V-compatible digital square-wave pulse signal. Microcontrollers like Arduino or ESP32 can calculate the instantaneous flow rate ($Q=F/98$) or total accumulated volume by counting digital pulses over time.

Key Features and Benefits

• Low-Flow Precision Measurement: Accurately senses low volumetric flow rates between $0.3\text{ L/min}$ and $6.0\text{ L/min}$.

• Integrated Hall-Effect Digital Pulse Output: Simple 3-wire digital interface produces square waves easily read by digital interrupt pins on microcontrollers.

• Wide Operating Voltage Range ($5\text{V}-18\text{V DC}$): Operates on standard $5\text{V}$ logic levels provided directly by Arduino, ESP32, or Raspberry Pi GPIO rails.

• High-Pressure Resistance: Sealed housing withstands water pressures up to $1.75\text{ MPa}$ ($17.5\text{ bar}$) without leakage.

• Durable & Safe Construction: Features a wear-resistant stainless steel shaft and durable food-grade plastic housing.

• Compact Hose Barb Connections: Dual $3.5\text{mm}$ outer diameter barbed ports allow leak-free attachment to flexible silicone or PVC tubing.

Technical Specifications

Interface & Wiring Guide

1. Pinout Wiring:

• Red Wire ($VCC$): Connect to $+5\text{V DC}$ power supply.

• Black Wire ($GND$): Connect to System Ground ($0\text{V}$).

• Yellow Wire ($SIGNAL/OUT$): Connect to Digital Interrupt Pin on Microcontroller (e.g., Pin 2 on Arduino Uno).

2. Flow Rate Calculation Formula:

INSTALLATION ADVISORY:

1. Pay close attention to the arrow marked on the sensor housing to ensure fluid flows in the correct direction (Inlet $\to$ Outlet).

2. Ensure the liquid is clean and free of debris; particulate matter can jam the internal rotor. Installing an inline micro-filter upstream is recommended for dirty fluids.

Applications

• Coffee Machines & Tea Makers: Precision water measurement for automated cup filling and dosing.

• Smart Water Dispensers & Purifiers: Monitoring filter life and controlling dispensed water quantities.

• Medical & Chemical Dosing Systems: Low-volume fluid metering in laboratory automation.

• Liquid Cooling Loops: Monitoring coolant circulation in PC water-cooling systems and laser cutters.

Package Includes

• 1 x YF-S401 Water Flow Sensor Flowmeter (0.3–6L/min, White Body) with 3-pin JST Wire Harness

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components