Water Flow Sensor YF-S201

Water flow sensor for measuring the flow rate of water or other liquids. You connect this sensor between a water pipe or water hose and it uses a pinwheel sensor to measure how much liquid passes through it. The pinwheel has a small magnet attached and a Hall-effect magnetic sensor on the other side of the plastic tube that can measure how many spins the pinwheel has made through the plastic wall.

The water flow sensor is supplied with three wires: red (5-18VDC), black (ground) and yellow (Hall-effect pulse output). By counting the pulses from the sensor output, you can track the liquid flow: each pulse is about 2.25 milliliters. Note that this is not an accurate sensor and the pulse can vary depending on flow rate, liquid pressure and sensor alignment. Careful calibration is needed if more than 10% precision is required.

Water flow sensor specifications:

• Type: YF-S201
• Maximum 30 liters per minute
• Works on: 5 to 18VDC
• Max current draw: 15mA @ 5V
• Flow Rate: 1 to 30 Liters/Minute
• Temperature range: -25 to 80°C
• Humidity Range: 35%-80% RH
• Maximum water pressure: 1.75Mpa
• Pipe / connection diameter: 1/2″ / 20mm
• Color: white

Dimensions
Length: 6,2cm
Width: 3,5cm
Height: 3,6cm