Water Flow Sensor 1/2" (ZJ-S201)

Description

The ZJ-S201 1/2" Water Flow Sensor is a reliable and easy-to-use device designed to sit in line with your water line to measure how much liquid has moved through it. The sensor contains a pinwheel rotor and an integrated magnetic Hall effect sensor that outputs an electrical pulse with every revolution. The Hall effect sensor is completely sealed from the water pipe, ensuring the sensitive electronics stay dry and safe.

The sensor features a simple three-wire interface: Red (2.5V-24V DC power), Black (Ground), and Yellow (Hall effect pulse output). By counting the pulses from the output of the sensor using a microcontroller like an Arduino, you can easily calculate water flow. The pulse signal is a standard square wave, making it straightforward to log and convert into liters per minute using the formula: Pulse frequency (Hz) / 7.5 = flow rate in L/min.

Note: This is not a high-precision industrial sensor. The pulse rate can vary slightly depending on flow rate, fluid pressure, and sensor orientation. It will need careful calibration if better than 10% precision is required, but it is excellent for basic measurement and DIY IoT tasks!

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Specifications

• Model: ZJ-S201
• Sensor Type: Magnetic Hall Effect
• Working Voltage: 2.5V to 24V DC
• Maximum Current Draw: 15mA (at 5V)
• Working Flow Rate: 1 to 30 Liters/Minute
• Maximum Water Pressure: ≤ 1.75 MPa
• Accuracy: ±10%
• Output Duty Cycle: 50% ± 10%
• Flow Rate Formula: Frequency (Hz) = 7.5 × Flow rate (L/min)
• Pipe Connections: 1/2" Inner Diameter (ID), 3/4" Outer Diameter (OD)
• Working Temperature Range: -25°C to +80°C
• Working Humidity Range: 35% - 80% RH
• Cable Length: Approx. 15cm

Applications

• Smart Gardening: Monitoring water usage in automated drip irrigation or hydroponic systems.
• Home Automation: Building smart water meters to track household water consumption.
• Automated Dispensers: Measuring liquids for custom beverage dispensers or liquid mixing vats.

Frequently Asked Questions (FAQ)

Q: What do the three wire colors mean?
A: Standard wiring is: Red is VCC (Power Input, 2.5V-24V DC), Black is Ground (GND), and Yellow is the PWM/Pulse Signal Output that connects to your microcontroller's digital input pin.

Q: Does it matter which direction the water flows?
A: Yes. There is a small arrow molded into the plastic casing of the sensor. Water must flow in the direction of this arrow to properly spin the rotor and generate an accurate reading.

Q: How do I improve the accuracy of the sensor?
A: Because fluid pressure and orientation affect the spin rate, the best way to improve accuracy is to install the sensor in its final, permanent position and run a known quantity of water (e.g., exactly 10 liters) through it. Count the total pulses and adjust the 7.5 multiplier in your code to match your specific real-world setup.

Package Includes

• 1 × ZJ-S201 1/2" Water Flow Sensor