YF-S401 1/8 Inch Hall Effect Water Flow Sensor – 0.5–5L/min, DC 5–18V

Accurately monitor water flow with the YF-S401 1/8″ Hall Effect Sensor. Compatible with 5–18V DC systems, this sensor supports 0.5–5L/min flow rate and up to 120°C.

The YF-S401 1/8 Inch Water Flow Sensor is a compact and efficient solution for measuring water flow in real time. Featuring a magnetic rotor and Hall Effect sensor, it outputs a digital NPN pulse signal proportional to flow rate, making it ideal for use in water heaters, beverage dispensers, and smart plumbing systems.

With a voltage range of DC 5–18V, high temperature resistance up to 120°C, and a durable POM construction, this sensor is built for both industrial and home automation applications. Its leak-proof design withstands up to 1.75MPa water pressure, ensuring reliability in demanding conditions.

Specifications:

• Model: YF-S401

• Port Size: 1/8 Inch (7mm)

• Flow Range:
   - Ø2.0mm: 0.5 – 3 L/min
   - Ø3.5mm: 0.5 – 5 L/min

• Voltage Range: DC 5 – 18V

• Sensor Type: Hall Effect – NPN Pulse Output

• High Level Output: > DC 4.7V

• Low Level Output: < DC 0.5V

• Material: POM

• Max Water Temp: ≤120°C

• Max Water Pressure: ≤1.75MPa

• Leak Test: 1.7MPa for 1 min – no leakage or deformation

• Applications: Water heaters, IoT flow control, filtration, irrigation