1/2 Inch Water Flow Sensor SEN-HZ21WA

💧 1/2 Inch Water Flow Sensor – SEN-HZ21WA
🧩 Overview
Measures water flow rate in pipelines
1/2 inch brass body ensures durability
Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers
Commonly used in water dispensers, irrigation systems, and DIY water projects
⚙️ Working Principle
Water flows through a turbine rotor inside the sensor
Rotor spins proportionally to the water flow rate
Hall-effect sensor generates digital pulses for each rotation
Microcontroller counts pulses → calculates flow rate in L/min
📊 Key Specifications
🔹 Pipe Size: 1/2 inch (DN15)
🔹 Working Voltage: 5–24V DC
🔹 Output Type: Digital pulse (Hall effect)
🔹 Flow Range: 1–30 L/min
🔹 Working Pressure: < 1.75 MPa
🔹 Temperature Range: 0–80°C
🔹 Pulse Output: 450 pulses/L (approx.)
🔹 Material: Brass body with plastic rotor
🧱 Module Components
Brass housing
Plastic turbine rotor
Hall-effect sensor
Three wires: Red (VCC), Black (GND), Yellow (Signal)
🔄 Features
Accurate real-time water flow measurement
Durable brass construction → corrosion-resistant
Easy interface with Arduino / ESP32 / Raspberry Pi
Compact and reliable for DIY projects
🛠️ Applications
Water dispensers 💧
Home or industrial irrigation systems 🌱
Smart faucets and automated water systems
Aquarium water management
Flow monitoring in DIY electronics projects
⚠️ Usage Tips
Install inline with water flow respecting the arrow direction
Avoid dry running to prevent rotor damage
Use filtered water to prevent debris from jamming rotor
Ensure proper wiring for digital pulse output
✅ Advantages
Durable brass body
Wide flow range (1–30 L/min)
Easy digital interface for microcontrollers
Reliable and low-maintenance
⚠️ Limitations
Accuracy affected by turbulent or air-bubbled water
Requires straight pipe section before and after the sensor
Not suitable for high-pressure fluids (>1.75 MPa)