Description
The YF-B6 with Temperature Detection is a Hall-effect turbine water flow sensor bundled with an NTC temperature probe, designed for simultaneous measurement of flow rate and liquid temperature in water heaters, coffee machines, water dispensers, and campus card billing systems. The flow sensor features a copper/brass housing with G3/4″ (DN20) double male threaded connections on both inlet and outlet, while the temperature probe is typically a separate NTC thermistor (50KΩ, Beta 3950) that can be installed in the same water line via its M8 thread .
The flow 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), corresponding to approximately 396 pulses per liter . The temperature probe provides an analog resistance output that varies with temperature, suitable for ADC reading with a voltage divider or dedicated thermistor interface.
The copper body withstands up to 1.75 MPa pressure and handles liquid temperatures up to 100–120°C (depending on the source) . The flow sensor operates from DC 3.5–24V (5V typical) with a maximum current draw of 15mA, and outputs an NPN pulse signal with high level >4.5–4.7V at 5V supply .
Critical limitations: This is a low-cost, non-certified sensor bundle for hobbyist, educational, and light commercial use. For 3.3V microcontrollers (ESP32, ESP8266), the flow pulse output requires a logic level shifter or voltage divider to protect GPIO pins. The temperature probe requires a separate ADC channel and a pull-up resistor for reading. A filter screen must be installed upstream to prevent debris from jamming the turbine .
Features
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Dual Measurement (Flow + Temperature): Bundled NTC probe (50KΩ, Beta 3950) enables simultaneous flow and temperature monitoring .
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Copper/Brass Housing with Double Male Threads: Both flow sensor 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; 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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Separate NTC Temperature Probe: 50KΩ NTC with Beta 3950, M8 threaded fitting, 2-pin connector .
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Flow Range 1–30 L/min: Suitable for water heaters, coffee machines, and water dispensers .
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High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .
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Wide Voltage Range (DC 3.5–24V per MIKROE): Flexible compatibility with 5V and higher supply systems .
Technical Specifications
| Parameter | Specification (Flow Sensor) |
|---|---|
| Model | YF-B6 (with temperature detection) |
| Connection Size | G3/4″ (DN20), double male thread |
| Body Material | H57 Copper + POM |
| Operating Voltage | DC 3.5–24V (MIKROE); DC 5–15V (Seeed) |
| Max Current Draw | 15mA @ 5V |
| Output Signal | NPN pulse; high >4.5V, 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 | ±5% (MIKROE); ±3% (Seeed, 1–25 L/min) |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | ≤80°C (ambient) |
| Liquid Temperature | ≤100–120°C |
| Parameter | Specification (Temperature Probe) |
|---|---|
| Type | NTC Thermistor |
| Resistance | 50KΩ |
| Beta Value | 3950 |
| Connector | JST-SM 2-pin female |
| Thread | M8 |
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