SEN-HZ21WA G1/2” Water Flow Sensor – Nylon Flow Meter

💧 SEN-HZ21WA G1/2” Water Flow Sensor — Nylon Flow Meter (Technical Information)
🔍 Overview
The SEN-HZ21WA water flow sensor is a turbine-based liquid flow sensor designed to measure the flow rate of water in pipelines.
Measures:
Water flow rate (L/min)
Output:
Digital pulse signal
Type:
Hall-effect based flow sensor
👉 It is widely used for real-time water flow monitoring systems.
⚙️ Working Principle
🌊 Turbine + Hall Effect Sensing
1. 🔄 Fluid Flow Movement
Water enters the sensor body
Rotates an internal turbine (impeller)
2. 🧲 Magnetic Detection
A magnet attached to the turbine rotates
A Hall-effect sensor detects rotation
3. 📡 Pulse Generation
Each rotation produces electrical pulses
Pulse frequency is proportional to flow rate
📐 Flow Equation
F=10Q (±10%)F = 10Q \ (\pm 10\%)F=10Q (±10%)
F = frequency (Hz)
Q = flow rate (L/min)
👉 Higher flow → higher pulse frequency.
📊 Measurement Characteristics
Flow range: 1 to 30 L/min
Start flow: ~low flow threshold (~1 L/min typical)
Accuracy: ±10% (approx.)
Pulse output relation:
~516 pulses per liter
⚡ Electrical Characteristics
Operating voltage: ~5V DC
Current consumption: ≤15 mA
Output:
Digital pulse (square wave)
🔗 Output Interface
Pulse Output
Each pulse corresponds to a small volume of water
Microcontroller counts pulses to calculate:
Flow rate
Total volume
Signal Characteristics
TTL-level output
Duty cycle ~50%
🧠 Internal Structure
Nylon body housing
Turbine (rotor/impeller)
Embedded magnet
Hall-effect sensor
Signal conditioning circuit
👉 Sensor electronics are isolated from water path.
🔧 Mechanical Characteristics
Thread size: G1/2” (standard pipe fitting)
Material: Nylon (PA66)
Max pressure: ~1.75 MPa
Fluid type: Clean water (non-corrosive)
🔄 Operating Behavior
✔ Flow Measurement
Flow increases → turbine spins faster → more pulses
✔ Real-Time Monitoring
Continuous pulse output enables:
Instant flow calculation
Total volume tracking
✔ Low Pressure Start
Can operate at relatively low water pressure
🌡️ Environmental Characteristics
Suitable for:
Water systems (≤60°C typical)
Not suitable for:
High-temperature liquids
Corrosive fluids
⚠️ Limitations
Accuracy depends on:
Flow stability
Calibration
Sensitive to:
Air bubbles
Debris in water
Not suitable for:
Very low flow rates (below threshold)
Measures:
Flow only (not pressure or level)
🔌 Typical Pin Configuration
Red → VCC (5V)
Black → GND
Yellow → Pulse output
🧩 Functional Role
The sensor acts as a:
Water flow rate sensor
Volume measurement device
Digital pulse-based flow meter
🏁 Summary
The SEN-HZ21WA G1/2” Nylon Flow Sensor is a turbine-based flow measurement device that:
Uses Hall-effect sensing for pulse generation
Measures 1–30 L/min water flow
Provides digital pulse output
Supports real-time flow and volume calculation
Is designed for pipeline integration with standard G1/2 threads