YF-S401 Water Flow Sensor حساس تدفق الماء

The YF-S401 Water Flow Sensor is an inline, pulse-output sensor designed to provide reliable flow measurement for low-flow applications. It operates from 5–12 V DC and produces digital pulses proportional to the volume of water passing through the sensor. The device’s compact dimensions and lightweight construction make it suitable for integration into small systems where accurate pulse-based flow feedback is required. Supply Voltage: 5–12 V DC. Water Flow Range: 0.3–6 L/min, with an accuracy of ±5%. Inner Diameter: 4 mm; Outside Diameter: 7 mm. Nozzle Size Standard: Type 18 (1/8" / 3.175 mm). Proof Water Pressure: <0.8 MPa. Operating Current: 15 mA at 5 V DC. Insulation Resistance: >100 MΩ. Output Pulse Levels: High >4.5 VDC and Low <0.5 VDC when input is 5 VDC. Water-flow Formula: 1 L = 5880 pulses (square waves). Working Humidity Range: 35%–90% RH (no frost). Dimensions: 58 × 35 × 26 mm; Weight: 30 g. The sensor’s electrical output and pulse-per-liter specification allow straightforward integration with microcontrollers and data acquisition systems for pulse counting and flow calculation. Physical specifications and rated pressure should be observed when selecting tubing and mounting to ensure reliable operation and to maintain accuracy within the specified range.