YF-B4 Copper Water Flow Sensor with Hall Effect and G1/2 Thread

The YF-B4 is a copper-body water flow sensor that uses the hall effect principle to convert liquid flow into a digital pulse signal. As water passes through the internal rotor, the rotation speed changes proportionally with the flow rate, and the integrated hall effect sensor outputs a pulse for each revolution. This design allows the YF-B4 water flow sensor to measure flow rates from 1 to 25 liters per minute with a simple frequency relationship of F = 11 × Q, where Q is the flow rate in L/min. The brass housing provides greater durability and corrosion resistance than plastic alternatives, while the G1/2 male-inlet and female-outlet threads simplify installation in pipelines, coffee machines, water heaters, and smart metering systems. Operating on a wide 5V to 15V DC supply with a typical current of 15mA, the sensor interfaces easily with Arduino, Raspberry Pi, and other microcontrollers. The hall element is sealed from the water path, keeping the electronics dry and protected during continuous operation. With a maximum pressure rating of 1.75MPa and a liquid temperature tolerance of up to 120°C, this water flow meter is suitable for both domestic and light industrial flow monitoring tasks. The three-wire connection (red for VCC, black for GND, yellow for signal) further reduces wiring complexity in embedded projects.