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Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor
Water Flow Sensor

EMS-00016-B

(Last updated) Jun 20, 2026

Water Flow Sensor

Measures water flow rate

YF-S401 Water Flow Sensor is a compact hall-effect based flow meter used to measure water flow rate in pipes and tubing systems. It uses a rotor with embedded magnets that spins as water flows, generating pulse signals via a hall sensor proportional to flow rate. It is widely used in smart irrigation, water dispensers, liquid monitoring, automation systems, and Arduino/ESP32 projects.
Product Type Water Flow Sensor
Model YF-S401
Sensor Type Hall Effect Flow Meter
Operating Voltage 5V – 18V DC
Working Current ≤ 15 mA
Flow Range 0.3 – 6 L/min