Description
The YF-B8 is a Hall-effect turbine water flow sensor featuring a brass housing with a G1/2″ (DN15) connection and a compact 68mm body length. It is designed for accurate flow measurement in water heaters, water dispensers, coffee machines, and smart irrigation systems, where the brass body offers superior durability and corrosion resistance compared to plastic alternatives .
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 ±3% accuracy, and the pulse frequency follows the relationship F = 6.6 × Q (Hz, where Q is flow rate in L/min), corresponding to approximately 396 pulses per liter (each pulse ≈ 2.53 mL) .
The sensor operates from DC 3.5–24V (per one supplier ) or DC 5–18V (per others ), with a maximum current draw of 15mA. The output is an NPN pulse signal with high level >4.5V and low level <0.5V at 5V supply . The brass body withstands up to 1.75 MPa pressure and handles liquid temperatures up to 100°C .
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 (>4.5V 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.
Features
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Brass Housing Construction: Corrosion-resistant and durable; suitable for hot water and pressurized systems .
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Hall-Effect Pulse Output: Digital square wave proportional to flow rate; F = 6.6 × Q (Hz) .
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~396 Pulses per Liter: Good resolution for volume tracking; each pulse ≈ 2.53 mL .
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Flow Range 1–30 L/min: Suitable for water heaters, dispensers, and coffee machines .
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Wide Voltage Range (DC 3.5–24V per one source): Flexible compatibility with different supply systems .
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High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .
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Liquid Temperature up to 100°C: Brass body handles hot water applications .
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Compact 68mm Body: Space-saving design for inline installation .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-B8 |
| Connection Size | G1/2″ (DN15) |
| Thread Configuration | Conflicting: female inlet/male outlet vs. double male — verify your unit |
| Body Material | Brass |
| Body Length | 68mm |
| Operating Voltage | DC 3.5–24V or DC 5–18V |
| Max Current Draw | 15mA |
| Output Signal | NPN pulse; high >4.5V, low <0.5V (at 5V input) |
| Flow Rate Range | 1–30 L/min ±3% |
| Frequency Formula | F = 6.6 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~396 pulses/L (≈2.53 mL per pulse) |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | -20°C to +100°C |
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