OF06ZAT G3/4 DN20 Water Flow Sensor - Hall Effect Pulse Output

The sensor provides an open-collector pulse output. Connect the sensor's V+ to 7-24VDC, GND to ground, and the signal wire to a digital input pin on your Arduino. You must use an external pull-up resistor (e.g., 10kΩ) between the signal wire and your logic voltage (5V or 3.3V) for reliable readings. The pulse frequency corresponds directly to the flow rate.

The OF06ZAT is designed for low-viscosity, non-corrosive fluids as specified: water, milk, diesel, gasoline, and light oils. It is not recommended for highly viscous fluids, abrasive slurries, or corrosive chemicals, as these can damage the plastic housing and oval gear mechanism, leading to inaccurate readings or sensor failure.

The IP64 rating indicates protection against dust ingress and water splashes from any direction. This makes the sensor suitable for indoor use where it may be exposed to occasional splashes or high humidity, but it is not submersible or suitable for outdoor use in direct rain or high-pressure wash-down environments.

The sensor has a pulse constant (K-factor) of 1.2 mL per pulse. To calculate flow rate, count the number of pulses over a known time period. For example, 1000 pulses in 10 seconds equals 1200 mL (1.2 L) in 10 seconds, which is a flow rate of 7.2 LPM. Most data acquisition systems or microcontrollers can be programmed to perform this calculation automatically.