Description
The YF-B9 is a Hall-effect turbine water flow sensor featuring a copper/brass housing with a G3/4″ (DN20) threaded connection. It is designed for medium-to-high flow measurement in water quality monitoring, hydroponics, aquariums, industrial water treatment, and smart irrigation systems .
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 2–50 L/min, with a maximum water pressure of 1.75 MPa .
The sensor operates from DC 3.5–24V (per Russian supplier and Alibaba listing) or DC 5–15V (per Zbotic and Iranian supplier) , with a maximum current draw of approximately 15mA. The output is an NPN pulse signal with high level >4.7V at 5V input .
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. Note that one supplier explicitly states the YF-B9 is “suitable for cold water only” and not rated for sustained hot water temperatures , which conflicts with another source listing liquid temperature up to 120°C . Verify your unit’s temperature rating with your supplier.
Features
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Copper/Brass Housing: Corrosion-resistant and durable; suitable for water monitoring and industrial applications .
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Hall-Effect Pulse Output: Digital square wave proportional to flow rate; pulse factor varies by source (verify with supplier).
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Flow Range 2–50 L/min: Suitable for medium-to-high flow applications including branch lines and irrigation .
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G3/4″ (DN20) Threaded Connection: Standard ¾-inch pipe size for easy integration .
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Wide Voltage Range (DC 3.5–24V per some sources): 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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Sealed Hall Sensor: Electronics isolated from the water path for durability .
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Compact Brass Body: Durable threads for better sealing with standard plumber’s tape .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-B9 |
| Connection Size | G3/4″ (DN20) |
| Thread Configuration | Verify with supplier (not clearly documented as female/female) |
| Body Material | Copper/Brass |
| Operating Voltage | DC 3.5–24V or DC 5–15V |
| Max Current Draw | ~15mA |
| Output Signal | NPN pulse; high >4.7V, low <0.5V (at 5V input) |
| Flow Rate Range | 2–50 L/min |
| Pulse Formula | Varies: (8.1Q-3) , 8Q-4 , or 476 pulses/L |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | ≤80°C (per one source) |
| Liquid Temperature | ≤120°C (per one source) ; “cold water only” (per another) |
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