Hall water flow sensor DN15 G1/2 copper flow meter YF-B3 [water inlet outer teeth 4 points water outlet outer teeth 4 points]

Description

The YF-B3 is a Hall-effect turbine water flow sensor featuring a brass housing with G1/2″ (DN15) double male threaded connections on both inlet and outlet. Unlike the YF-B2 (male inlet / female outlet), the YF-B3 provides male threads on both ends, allowing it to be installed between two female fittings or connected using standard G1/2 female couplers. This configuration is common in water heater inlet lines, water dispensers, and campus card billing systems where a straight inline sensor is required.

The sensor operates on a turbine principle: water flowing through the body spins a magnetic rotor, and an integrated Hall-effect sensor detects the rotation, outputting a digital pulse train proportional to flow rate . The pulse frequency follows the relationship F = 11 × Q (Hz, where Q is flow rate in L/min), corresponding to approximately 660 pulses per liter (each pulse ≈ 1.52 mL) . The rated flow range is 1–25 L/min with ±3% accuracy .

The brass body (H57 copper + POM internals) withstands up to 1.75 MPa pressure and handles liquid temperatures up to 120°C in some specifications, though the operating temperature range is typically listed as -20°C to +80°C . The dimensions are approximately 66mm total length with 18mm thread length, and the sensor weighs approximately 99g .

Critical limitations: This is a low-cost, non-certified sensor for hobbyist, educational, and light commercial use. For 3.3V microcontrollers (ESP32, ESP8266), the pulse output high level (>4.7V at 5V supply) requires a logic level shifter or voltage divider to protect GPIO pins . An 80–100 mesh filter should be installed upstream to prevent debris from jamming the turbine.

Features

• Brass Housing with Double Male Threads: Both inlet and outlet are G1/2″ male threads, suitable for inline installation between female fittings .

• Hall-Effect Pulse Output: Digital square wave proportional to flow rate, readable by any microcontroller with an interrupt-capable GPIO .

• 660 Pulses per Liter: Good resolution for volume tracking and billing applications; each pulse ≈ 1.52 mL .

• Flow Range 1–25 L/min: Suitable for water heaters, water dispensers, and campus card metering systems .

• Hot Water Compatible: Brass body handles liquid temperatures up to 120°C (verify with your unit) .

• High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .

• Wide Voltage Range (DC 5–15V typical): 5V standard for Arduino; some sources list 3.5–24V tolerance .

• NPN Pulse Output: 50% duty cycle with high level >4.7V at 5V supply .

Technical Specifications