YF-B1 / YF-B2 / YF-B3 Water Flow Sensor Switch – DC 5V–18V Copper Hall Effect Meter

Ensure accurate and reliable water flow measurement with this durable Hall Effect flow sensor series. Designed for precision and long-lasting performance, each model provides high stability, corrosion resistance, and easy wiring for a wide range of water control and monitoring applications.

Features

• High-precision flow detection with ±3% accuracy

• Durable copper and high-quality plastic construction

• Wide working voltage range (DC 5V–18V)

• Stable performance and long service life

• Easy to install and connect with standard G1/2" threaded fittings

• Built-in Hall sensor provides consistent pulse output signals

Specifications

Model: YF-B1

• Interface Size: G1/2 (4-point thread)

• Working Voltage: DC 5V–18V

• Inner Diameter: Inlet 15.4 mm / Outlet 13.5 mm

• Outer Diameter: 20.5 mm

• Thread Length: 9.3 mm

• Water Pressure Resistance: ≤1.75 MPa

• Output Pulse (High Level): >DC 4.7V (input 5V)

• Duty Cycle: 50% ±10%

• Insulation Resistance: >100 MΩ

• Flow Range: 1–25 L/min ±3%

• Pulse Frequency: (Hz) = [11 × Q] ±5% (Q = L/min)

• Tightness Test: 1.7 MPa for 1 min, no leakage or deformation

Model: YF-B2

• Interface Size: Inlet – 4 outer teeth, Outlet – 4 inner teeth (G1/2)

• Working Voltage: DC 5V–18V

• Inner Diameter: Inner tooth 20.8 mm / Outer tooth 14.5 mm

• Outer Diameter: 20.7 mm

• Thread Length: 10.6 mm

• Material: Copper

• Water Pressure Resistance: ≤1.75 MPa

• Output Pulse (High Level): >DC 4.7V (output 5V)

• Duty Cycle: 50% ±10%

• Tightness Test: 1.7 MPa for 1 min, no leakage or deformation

Model: YF-B3

• Interface Size: Inlet – 4 outer teeth, Outlet – 4 inner teeth

• Working Voltage: DC 5V–18V

• Inner Diameter: 15 mm / Outer Diameter: 20.8 mm

• Thread Length: Long 18.5 mm / Short 10.5 mm

• Material: Copper

• Water Pressure Resistance: ≤1.75 MPa

• Output Pulse (High Level): >DC 4.7V (input 5V)

• Duty Cycle: 50% ±10%

• Insulation Resistance: >100 MΩ

• Flow Range: 1–25 L/min ±3%

• Flow Pulse Formula: (11 × Q) ±3% (Q = L/min)

• Tightness Test: 1.7 MPa for 1 min, no leakage or deformation

Wiring Instructions

• Red (IN): Connect to positive (+) power supply

• Black (GND): Connect to negative (–) power supply

• Yellow (OUT): Signal output line

Package Includes

• 1 × Water Flow Sensor (Model YF-B1 / YF-B2 / YF-B3)

Applications

Perfect for water heaters, coffee machines, water dispensers, filtration systems, industrial control, and other flow measurement or automation projects.