Description
The YF-B7 is a Hall-effect turbine water flow sensor featuring a copper/brass housing with a G1/2″ (DN15) connection. It is designed for accurate flow measurement in water dispensers, coffee machines, and water heaters, where the copper body offers longer life and better sealing performance than 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 1–25 L/min, with a frequency relationship of F = 11 × Q (Hz, where Q is flow rate in L/min), corresponding to approximately 660 pulses per liter . The copper body (H57 copper + POM) withstands up to 1.75 MPa pressure and handles liquid temperatures up to 120°C .
The sensor operates from DC 5V to 15V with a maximum current draw of 15mA at 5V, and outputs an NPN pulse signal with high level >4.7V and low level <0.5V at 5V supply . The output pulse duty cycle is 50% ± 10% .
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.
Features
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Copper/Brass Housing: Longer life and better sealing performance than plastic-bodied sensors; suitable for hot water applications .
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Hall-Effect Pulse Output: Digital square wave proportional to flow rate; F = 11 × Q (Hz) .
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~660 Pulses per Liter: Good resolution for volume tracking; each pulse ≈ 1.52 mL .
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Flow Range 1–25 L/min: Suitable for water dispensers, coffee machines, and water heaters .
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Wide Voltage Range (DC 5–15V): 5V typical for Arduino; minimum operating voltage 4.5V .
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High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .
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Liquid Temperature up to 120°C: Brass body handles hot water .
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RoHS Compliant: Meets environmental compliance requirements .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-B7 |
| Connection Size | G1/2″ (DN15) |
| Thread Configuration | Double male (per official datasheet) — verify your unit |
| Body Material | H57 Copper + POM |
| Operating Voltage | DC 5V – 15V (min 4.5V) |
| Max Current Draw | 15mA @ 5V |
| Output Signal | NPN pulse; high >4.7V, low <0.5V (at 5V input) |
| Flow Rate Range | 1 – 25 L/min |
| Frequency Formula | F = 11 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~660 pulses/L (≈1.52 mL per pulse) |
| Accuracy | ±3% |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | 0 – 80°C |
| Liquid Temperature | ≤120°C |
| Dimensions | Approx. 66mm length, 10mm thread |
| Weight | Approx. 134g |
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