Description
The YF-G1 is a Hall-effect turbine water flow sensor designed for inline measurement of liquid flow rate and total volume in plumbing, irrigation, industrial monitoring, and automation systems. It features a 1-inch (G1″ / DN25) male threaded connection and is intended for medium-to-high flow water lines where smaller 1/2-inch sensors cannot accommodate the required flow rate.
The sensor consists of a nylon and fiberglass body containing a magnetic turbine rotor and a Hall-effect sensor sealed from the water path. As water flows through, the rotor spins at a rate proportional to flow velocity, and the Hall sensor outputs an NPN pulse train. The pulse frequency is proportional to flow rate, allowing the microcontroller to calculate instantaneous flow (L/min) and cumulative volume (liters). The YF-G1 is rated for a flow range of 2–100 L/min, with a pulse characteristic of ~64.8 pulses per liter and a frequency relationship of F = 1.08 × Q (Hz, where Q is L/min) according to the most detailed supplier data .
The sensor operates from DC 3.5V to 24V with a maximum current draw of 15–20mA and outputs an NPN pulse signal with a 50% duty cycle . Accuracy is specified at ±3% by most suppliers . The maximum water pressure is ≤1.75 MPa, and the operating temperature range is -20°C to +80°C .
Critical limitations: This is a low-cost, non-certified sensor intended for educational, hobbyist, and light commercial use. For 3.3V microcontrollers (ESP32, ESP8266), the pulse output amplitude follows the supply voltage—if powered from 5V or higher, a logic level shifter or voltage divider is required to protect the GPIO pins . The sensor is suitable for clean water only; debris or particles can damage the turbine .
Features
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G1″ (DN25) Threaded Connection: Standard 1-inch pipe size for medium-to-high flow water lines in plumbing and irrigation .
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Hall-Effect Turbine Measurement: Internal magnetic rotor and Hall sensor generate a stable pulse signal proportional to flow rate .
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Wide Flow Range (2–100 L/min): Suitable for water heaters, irrigation systems, and industrial flow monitoring .
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~64.8 Pulses per Liter (per detailed supplier): Provides good resolution for volume tracking .
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Wide Voltage Range (DC 3.5–24V): Compatible with 3.3V, 5V, and industrial control systems .
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Low Power Consumption: Maximum 15–20mA .
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Sealed Hall Sensor: The sensing electronics are isolated from the water path, ensuring long life .
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Durable Nylon Construction: Nylon + fiberglass body suitable for clean water applications .
Technical Specifications
| Parameter | Specification (per most detailed supplier data) |
|---|---|
| Model | YF-G1 |
| Connection Size | G1″ (DN25) male thread |
| Sensor Type | Hall-effect, magnetic turbine |
| Working Voltage | DC 3.5V – 24V |
| Max Current Draw | <15mA (some list ≤20mA) |
| Output Signal | NPN pulse, 50% duty cycle |
| Flow Rate Range | 2 – 100 L/min |
| Pulse Formula | F = 1.08 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~64.8 pulses/L |
| Accuracy | ±3% |
| Max Water Pressure | <1.75 MPa |
| Operating Temperature | -20°C to +80°C |
| Body Material | Nylon + fiberglass |
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