Description
The YF-B6 is a Hall-effect turbine water flow sensor featuring a copper/brass housing with G3/4″ (DN20) double male threaded connections on both inlet and outlet. This larger-bore sensor is designed for accurate flow measurement in water dispensers, coffee machines, and fully automatic gas water heaters, where the 1/2″ (DN15) sensors cannot accommodate the required flow rate .
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 rated flow range is 1–30 L/min, with a frequency relationship of F = 6.6 × Q (Hz, where Q is flow rate in L/min). This corresponds to approximately 396 pulses per liter (each pulse ≈ 2.53 mL) when correctly interpreted as 6.6 pulses per second per L/min .
The sensor operates from DC 3.5V to 24V according to MIKROE, while Seeed Studio specifies DC 5V to 15V (minimum 4.5V) . The maximum current draw is 15mA at 5V, and the output is an NPN pulse signal with high level >4.7V and low level <0.5V at 5V supply . The copper body (H57 copper + POM) withstands up to 1.75 MPa pressure and handles liquid temperatures up to 120°C, making it suitable for hot water applications .
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. A filter screen should be installed upstream to prevent debris from jamming the turbine . Note that the pulse factor is a common source of confusion—Seeed Studio’s F = 6.6 × Q formula refers to pulses per second, not pulses per liter .
Features
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Copper/Brass Housing with Double Male Threads: Both inlet and outlet are G3/4″ (DN20) male threads; longer life and better sealing than plastic bodies .
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Hall-Effect Pulse Output: Digital square wave proportional to flow rate, readable by any microcontroller with an interrupt-capable GPIO .
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~396 Pulses per Liter: Good resolution for volume tracking; each pulse ≈ 2.53 mL when correctly calibrated .
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Flow Range 1–30 L/min: Suitable for water dispensers, coffee machines, and gas water heaters .
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Wide Voltage Range (DC 3.5–24V): Flexible compatibility with 5V and higher supply systems .
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High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .
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Hot Water Compatible: Liquid temperature up to 120°C .
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RoHS Compliant: Meets environmental compliance requirements .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-B6 |
| Connection Size | G3/4″ (DN20), double male thread |
| Body Material | H57 Copper + POM |
| Operating Voltage | DC 3.5V – 24V ; DC 5V – 15V per Seeed |
| Max Current Draw | 15mA @ 5V |
| Output Signal | NPN pulse; high >4.7V, low <0.5V (at 5V input) |
| Flow Rate Range | 1 – 30 L/min |
| Frequency Formula | F = 6.6 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~396 pulses/L (≈2.53 mL per pulse) |
| Accuracy | ±3% (1–25 L/min) |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | 0 – 80°C |
| Liquid Temperature | ≤120°C |
| Dimensions | Approx. 60mm length, 11mm thread |
| Weight | Approx. 152g |
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