3/4 Inch Water Flow Sensor SEN-HZ43WA
3/4 Water Flow Sensor SEN'HZ43WA
A water flow sensor like the SEN'HZ43WA measures the rate and volume of water flow through a pipe using a simple mechanical and electronic sensing method.
Core Concept How It Works
Water In [Rotor / Paddlewheel] Spins'Magnet Attached to Rotor'Hall Effect Sensor Detects'Electrical Pulses Sent to MCU'Flow Rate & Volume Calculated by Pulse Count
Water pushes a turbine/paddle wheel inside the sensor. A magnet on the wheel triggers pulses via a Hall effect sensor as it spins. Each pulse correlates to a small volume of water passing through. By counting pulses over time, you get flow rate and total volume.
SpecificatA |+----------------------------------------------------+| Effective Pipe Size | 3/4 (G3/4 thread) || Sensor Type | Hall Effect Flow Sensor || Material | Plastic (Body) || Flow Range | 2 45 L/min || Voltage Range | DC 3V 12V (typ. DC5V) || Operating Current | ~15 mA || Max Water Pressure | 1.75 MPa || Operating Temp | -25C to 80C || Pulse Output | Digital pulse signal || Conversion Rate | ~477 pulses per liter || Connector Wires | 3 (Red/Black/Yellow) || Size (L'W'H) | ~603737 mm || Weight | ~43 g |+----------------------------------------------------+
Values are typical and may vary with manufacturer tolerances.
Pin / Wire Function
Red Power Input (DC 312V)Black GroundYellow Pulse Output
The yellow wire pulses at a frequency proportional to flow rate. Measuring pu
Hall Effect Output: Sensor output is digital each rotation of the wheel produces one pulse.
G3/4 Thread: Standard threaded connection for 3/4 plumbing fittings.
Low Power: Works with typical small microcontrollers (Arduino, ESP32, Raspberry Pi) which read pulse signals.
Typical Working Principle
Flow (L/min) Pulse Frequency (Hz)Q = F KWhere:Q = Flow rate (L/min)F = Pulse frequency (Hz)K = Conversion factor (~0.133 L per Hz)
(Example: If F = 10 Hz Q 1.33 L/min)Pulse calibration varies; check datasheet or measure experimentally.
Application Areas
Irrigation systems & water dispensers Water heaters & circulation systems DIY flow measurement projects Cooling systems & industrial automation'utime flow data
Installation & Practical Considerations
Orientation: Install the sensor in line with the pipe; match flow direction. Filtering: Install a screen filter upstream to prevent debris jamming the rotor. Straight Pipe: Best performance when installed with some straight pipe length before/after. Avoid Air Bubbles: Excessive air reduces accuracy. Voltage Levels: Match your MCU voltage; ideal voltage is around 5V for logic compatibility.
Summary What This Sensor Gives You
Digital pulse output for water flow measurement.
Easy integration with microcontrollers.
Works in many DIY/industrial water systems.
Provides both flow rate