YF-G1 Hall Water Flow Sensor DN25 1 Inch

The YF-G1 is a robust Hall-effect turbine water flow sensor designed for accurate, real-time water flow measurement in a wide range of plumbing, automation, and embedded control applications. Built around a nylon plastic valve body with an internal magnetic rotor assembly and a Hall-effect sensing element, it outputs a clean NPN pulse signal directly proportional to the water flow rate — making it straightforward to interface with any microcontroller using a single digital input pin.

As water passes through the G1-inch (DN25) threaded body, the internal turbine spins at a speed proportional to the flow rate. The Hall sensor converts this rotation into a pulse frequency following the formula F = 1.08 × Q (±5%), where Q is the flow rate in litres per minute — generating approximately 64.8 pulses per litre. This pulse count is easily processed in firmware to calculate instantaneous flow rate and cumulative volume, with no special libraries or signal conditioning required.

With a wide operating voltage range of 3.5–24V DC, a flow range of 2–100 L/min, and a maximum water pressure rating of up to 1.75MPa, the YF-G1 is ideal for garden irrigation controllers, water dispensers, aquaculture systems, solar water heaters, industrial flow monitoring, and Arduino or ESP32-based water management projects. Wire connections are colour-coded: Red = VCC, Black = GND, Yellow = Signal.

Specification:

• Model : YF-G1
• Sensor Type : Hall-effect turbine flowmeter
• Nominal Size : DN25 (1 inch)
• Thread Size : G1″ male thread
• Body Material : Nylon plastic
• Flow Range : 2 – 100 L/min
• Pulse Formula : F = 1.08 × Q ±5% (Q = L/min)
• Pulses per Litre : ~64.8 pulses/litre
• Measurement Accuracy : ±3%
• Output Signal : NPN pulse (open collector)
• Output Pulse Duty Cycle : 50% ±10%
• Output Load Capacity : ≤ 10mA
• Operating Voltage : DC 3.5V – 24V
• Working Current : ≤ 20mA
• Max Water Pressure : ≤ 1.75MPa
• Operating Temperature : 0°C – 80°C
• Wire Length : 150mm
• Wire Code : Red = VCC, Black = GND, Yellow = Signal
• Dimensions : 114 × 70 × 49mm
• Compatible Boards : Arduino, ESP32, Raspberry Pi, PIC, STM32