Description
The YF-DN50 is a Hall-effect turbine water flow sensor designed for inline measurement of liquid flow rate and total volume in large-diameter water systems, industrial monitoring, and commercial plumbing. It features a 2-inch (G2″ / DN50) male threaded connection and is intended for high-flow applications where smaller 1/2-inch or 3/4-inch sensors cannot accommodate the required flow rate.
The sensor consists of a nylon and glass fiber 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-DN50 is rated for a flow range of 10–200 L/min, with a pulse characteristic of ~12 pulses per liter and a frequency relationship of F = 0.2 × Q (Hz, where Q is L/min).
The sensor operates from DC 3.5V to 24V (5V typical) with a maximum current draw of <15mA and outputs an NPN pulse signal with a high level >4.7V (at 5V input). Accuracy is specified at ±3% by the manufacturer, though some suppliers list ±5%. 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; a filter must be installed at the water inlet to prevent particles and debris from damaging the turbine. The sensor should not be exposed to harsh outdoor environments or strong vibration.
Features
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2″ (DN50) Threaded Connection: Standard large pipe size for industrial and commercial water lines.
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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 (10–200 L/min): Suitable for water treatment, cooling systems, irrigation, and industrial process lines.
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~12 Pulses per Liter: Low pulse density appropriate for high-flow measurement.
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Wide Voltage Range (DC 3.5–24V): Compatible with 5V, 12V, and industrial control systems.
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Low Power Consumption: Maximum <15mA.
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NPN Pulse Output: Open-collector style output; pull-up resistor recommended for reliable logic reading.
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Durable Nylon Construction: Nylon + glass fiber body suitable for clean water applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-DN50 |
| Connection Size | G2″ (DN50) male thread |
| Sensor Type | Hall-effect, magnetic turbine |
| Working Voltage | DC 3.5V – 24V |
| Max Current Draw | <15mA |
| Output Signal | NPN pulse; high >4.7V, low <0.5V (at 5V input) |
| Flow Rate Range | 10 – 200 L/min |
| Pulse Formula | F = 0.2 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~12 pulses/L |
| Accuracy | ±3% (manufacturer); some list ±5% |
| Max Water Pressure | <1.75 MPa |
| Operating Temperature | -20°C to +80°C |
| Body Material | Nylon + glass fiber |
| Cable Length | 50 cm |
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