Description
The YF-DN32-T is a Hall-effect turbine water flow sensor featuring a brass housing with a G1-1/4″ (DN32) male threaded connection. It is designed for medium-to-high flow measurement in water heaters, water dispensers, industrial cooling systems, and smart water management applications where smaller 1/2″ or 3/4″ sensors cannot accommodate the required flow rate .
The sensor operates on a turbine principle: water flowing through the body spins a magnetic impeller (PA66 turbine with SUS304 shaft), and an integrated Hall-effect sensor detects the rotation, outputting a digital pulse train proportional to flow rate . The rated flow range is 3–120 L/min with ±3% accuracy, and the pulse frequency follows the relationship F = 1.8 × Q (Hz, where Q is flow rate in L/min) . This corresponds to approximately 108 pulses per liter .
The sensor operates from DC 5–24V with a maximum current draw of 15mA at 5V . The output is a 5V TTL pulse signal with a 50% duty cycle, and the high level is >4.5V at 5V supply . The brass body withstands up to 1.75 MPa pressure and handles liquid temperatures from -25°C to +80°C . The body length is 64mm, thread length 14mm, and the cable is approximately 47cm with a JST SM connector .
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 (>4.5V at 5V supply) requires a logic level shifter or voltage divider to protect GPIO pins . A filter should be installed upstream to prevent debris from jamming the impeller. Note that one supplier lists a narrower flow range of 3–60 L/min for the same model designation , so verify your unit’s actual range with your supplier.
Features
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Brass Housing with G1-1/4″ Male Threads: Both inlet and outlet are 1-1/4″ male threads; durable construction for pressurized water systems .
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Hall-Effect Pulse Output: Digital square wave proportional to flow rate; F = 1.8 × Q (Hz) per multiple independent sources .
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~108 Pulses per Liter: Good resolution for volume tracking; each pulse ≈ 9.26 mL .
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Flow Range 3–120 L/min: Suitable for water heaters, dispensers, and industrial cooling lines .
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Wide Voltage Range (DC 5–24V): Flexible compatibility with 5V and higher supply systems .
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High Pressure Resistance (≤1.75 MPa): Suitable for pressurized water systems .
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Wide Operating Temperature (-25~80°C): Suitable for varied environmental conditions .
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JST SM Connector with Color-Coded Wires: Red (VCC), Black (GND), Yellow (Signal) for straightforward wiring .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YF-DN32-T |
| Connection Size | G1-1/4″ (DN32), male-male thread |
| Body Material | Brass |
| Operating Voltage | DC 5–24V |
| Max Current Draw | 15mA @ 5V |
| Output Signal | 5V TTL pulse; high >4.5V, low <0.5V (at 5V input) |
| Flow Rate Range | 3–120 L/min |
| Frequency Formula | F = 1.8 × Q (Hz, Q in L/min) |
| Pulses per Liter | ~108 pulses/L (≈9.26 mL per pulse) |
| Accuracy | ±3% |
| Max Water Pressure | ≤1.75 MPa |
| Operating Temperature | -25°C to +80°C |
| Body Length | 64mm |
| Thread Length | 14mm |
| Cable Length | ~47cm, JST SM connector |
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