Description

YF-S401 Water Flow Sensor 0.3–6L/min Hall Effect Flow Meter

The YF-S401 Water Flow Sensor is a compact Hall Effect liquid flow sensor designed for accurate low-flow measurement in electronic control systems. With a measurement range of 0.3 to 6 liters per minute, it is an excellent choice for precision applications where standard water flow sensors are too large or lack sensitivity.

Compared with conventional flow sensors, the YF-S401 offers stable pulse output, fast response, and excellent repeatability, making it suitable for Arduino development boards, ESP32 controllers, Raspberry Pi projects, STM32 systems, and industrial embedded applications.

Its lightweight construction and reliable sensing technology allow engineers, makers, OEM manufacturers, and automation developers to integrate accurate water monitoring into compact equipment with minimal effort.

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Why Choose the YF-S401 Water Flow Sensor?

The YF-S401 is specifically engineered for low-flow applications where precision is essential. Whether you are developing a smart coffee machine, beverage dispenser, laboratory instrument, or automatic liquid control system, this sensor provides dependable flow detection with minimal pressure loss.

Key advantages include:

• High sensitivity Hall Effect sensing
• Stable pulse frequency output
• Excellent low-flow measurement accuracy
• Compact lightweight housing
• Easy integration with microcontrollers
• Long service life
• Low power consumption
• Suitable for continuous operation

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Typical Applications

The YF-S401 Water Flow Sensor is widely used in numerous industries and DIY electronics projects.

Typical applications include:

• Smart coffee machines
• Water dispensers
• Beverage equipment
• Medical devices
• Laboratory liquid monitoring
• RO water purification systems
• Smart irrigation systems
• Automatic dosing equipment
• Arduino projects
• Raspberry Pi automation
• ESP32 IoT systems
• Industrial liquid monitoring

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Key Features

High Accuracy Flow Detection

The Hall Effect sensor produces stable pulse signals proportional to water flow, allowing precise digital measurement with excellent repeatability.

Compact Low-Flow Design

Designed specifically for applications between 0.3–6L/min, the sensor delivers reliable performance even at very low flow rates.

Easy System Integration

Compatible with most popular embedded platforms including Arduino, ESP32, Raspberry Pi, STM32, PLC controllers, and other MCU systems.

Durable Construction

Manufactured with quality engineering plastics and corrosion-resistant internal components for long-term reliability.

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Technical Specifications

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Installation Tips

For optimal measurement accuracy:

• Install the sensor in the correct flow direction.
• Remove air bubbles before operation.
• Keep the pipeline completely filled with liquid.
• Avoid excessive vibration.
• Use clean water whenever possible.
• Calibrate pulse output in software for maximum accuracy.

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Compatible Platforms

The YF-S401 integrates seamlessly with many popular development environments.

Compatible devices include:

• Arduino UNO
• Arduino Mega
• ESP8266
• ESP32
• Raspberry Pi
• STM32
• PLC controllers
• Industrial automation systems

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Why Buy this YF-S401 water flow sensor from Fondyes?

At Fondyes, every water flow sensor is individually inspected before shipment to ensure dependable performance and consistent quality.

We provide:

• Fast worldwide shipping
• Strict quality inspection
• Professional technical support
• Stable OEM supply
• Competitive factory pricing
• Reliable after-sales service

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Learn More

➡ Visit our Water Flow Sensors Collection to explore additional flow sensors for different flow ranges.

Tutorial Video

https://www.youtube.com/watch?v=AqH8pcDnpZc

(This video search demonstrates installation, wiring, calibration, and testing procedures for the YF-S401 sensor.)

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Frequently Asked Questions

Q1: Can the YF-S401 measure very small water flow?

Yes. The YF-S401 is specifically designed for low-flow applications between 0.3 and 6L/min, making it ideal for precision liquid monitoring.

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Q2: Is this sensor compatible with Arduino?

Absolutely. The sensor outputs standard pulse signals that can be easily read by Arduino, ESP32, Raspberry Pi, STM32, and other microcontrollers.

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Q3: Can it be used with liquids other than water?

The sensor is primarily designed for clean water or similar low-viscosity liquids. Highly corrosive or contaminated liquids are not recommended.