Liquid Flow Sensor

Measure liquid/water flow for your solar, computer cooling, or gardening project using this handy basic flow sensor. This sensor sit in line with your water line, and uses a pinwheel sensor to measure how much liquid has moved through it. The pinwheel has a little magnet attached, and there's 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. This method allows the sensor to stay safe and dry.

Water flow sensor consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow. The hall-effect sensor outputs the corresponding pulse Signal.

The sensor comes with three wires: red (5-24VDC power), black (ground) and yellow (Hall effect pulse output).

By counting the pulses from the output of the sensor, you can easily track fluid movement: each pulse is approximately 2.25 milliliters. Note this isn't a precision sensor, and the pulse rate does vary a bit depending on the flow rate, fluid pressure and sensor orientation. It will need careful calibration if better than 10% precision is required. However, its great for basic measurement tasks!

Electrical Specfication

• Working Voltage: 5 to 24VDC
• Max current draw: 15mA @ 5V
• Working Flow Rate: 1 to 30 Liters/Minute
• Working Temperature range: -25 to 80°C
• Working Humidity Range: 35%-80% RH
• Maximum water pressure: 2.0 MPa
• Output duty cycle: 50% +-10%
• Output rise time: 0.04us
• Output fall time: 0.18us
• Liquid temperature <120 °C
• Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min)
• Pulses per Liter: 450
• Durability: minimum 300,000 cycles
• Weight 43 g

Mechanical

• 1/2" nominal pipe connections, 0.78" outer diameter, 1/2" of thread
• Size: 2.5" x 1.4" x 1.4"

Dimensions

Sensor Internal Components

Output Reference Frequency at different Flow Rates(Liters per Hour)