1. Product Overview
The DIGITEN G3/8 Water Flow Sensor (Model FL-308T) is a Hall effect flowmeter designed for precise liquid fluid measurement. It is suitable for various applications requiring flow monitoring, such as water heaters, water dispensers, water purifiers, and irrigation systems. This sensor provides a pulse signal output proportional to the water flow rate.
Figure 1: DIGITEN G3/8 Water Flow Sensor (Model FL-308T)
Key Features:
- Lightweight and compact design.
- Stable performance with low water pressure start.
- Integrated Hall effect sensor for electrical pulse output.
- Constructed from food-grade plastic for safety and reliability.
- Waterproof, heat-resistant, pressure-resistant, and cold-resistant properties.
2. Specifications
The following table details the technical specifications for the DIGITEN G3/8 Water Flow Sensor:
| Parameter | Value |
|---|---|
| Model Number | FL-308T |
| Working Voltage | 3-24V DC |
| Flow Range | 0.3-10 L/min |
| Maximum Current | 1.5 mA (DC 5V) |
| Operating Temperature | 0-80°C |
| Operating Humidity | 35%-90% RH |
| Pressure Range | 0.1-0.8 MPa |
| Storage Temperature | -25-80°C |
| Storage Humidity | 25%-95% RH |
| Output Waveform | Square Wave, Pulse Signal |
| Pulse Constant (F) | F = 23 * Q (L/Min) ±2% |
| Thread Size | G3/8 inch (BSP) |
| Material | Brass (connector), Plastic (body) |
| Cable Length | 15 cm |
Figure 2: Sensor dimensions and key specifications
3. Setup and Installation
Proper installation is crucial for accurate readings and reliable operation of the water flow sensor.
3.1 Wiring Instructions
The sensor features a 3-wire connection. Connect the wires as follows:
- Red Wire: VCC (+) - Connect to the positive power supply (3-24V DC).
- Black Wire: GND (-) - Connect to ground.
- Yellow Wire: Signal Output - Connect to your microcontroller or reading device.
Figure 3: Sensor with wiring label
Figure 4: Sensor with electrical connector
3.2 Plumbing Connection
The sensor uses G3/8 inch BSP (British Standard Pipe) threads. If connecting to NPT (National Pipe Taper) threads, it is recommended to use thread seal tape to ensure a watertight connection.
Ensure the sensor is installed with the correct flow direction. An arrow indicating the flow direction is marked on the sensor body. Align this arrow with the direction of water flow in your system.
Figure 5: Flow direction indicator on the sensor body
3.3 Placement Considerations
- Install the sensor in a section of pipe where the water flow is stable and free from turbulence.
- Avoid installing near pumps or valves that may cause sudden changes in flow or pressure.
- Ensure easy access for future maintenance or inspection.
4. Operating Principles
The DIGITEN G3/8 Water Flow Sensor operates on the Hall effect principle. Inside the sensor, a small turbine wheel rotates as water flows through it. A magnet is attached to this turbine, and a Hall effect sensor detects the magnetic field changes as the magnet passes by. Each rotation of the turbine generates an electrical pulse.
The frequency of these pulses is directly proportional to the water flow rate. The relationship is given by the formula: F = 23 * Q, where:
- F is the pulse frequency in Hz.
- Q is the flow rate in Liters per Minute (L/Min).
By measuring the pulse frequency, you can calculate the instantaneous water flow rate. The sensor outputs a square wave pulse signal, which can be easily read by microcontrollers or other digital input devices.
5. Maintenance
The DIGITEN G3/8 Water Flow Sensor is designed for low maintenance. However, periodic checks can help ensure its longevity and accuracy.
- Regular Inspection: Periodically check for any leaks at the connection points.
- Connection Integrity: Ensure electrical connections remain secure and free from corrosion.
- Debris Check: If flow readings become erratic or stop, inspect the sensor for any debris that might be obstructing the turbine's rotation. If necessary, disconnect the sensor and gently flush it with clean water. Avoid using harsh chemicals or abrasive tools.
- Storage: If storing the sensor for an extended period, ensure it is clean, dry, and stored within the specified storage temperature and humidity ranges.
6. Troubleshooting
If you encounter issues with your DIGITEN G3/8 Water Flow Sensor, consider the following troubleshooting steps:
6.1 No Signal Output
- Check Power Supply: Verify that the sensor is receiving the correct operating voltage (3-24V DC) and that the ground connection is secure.
- Inspect Wiring: Ensure all three wires (Red, Black, Yellow) are correctly connected to your system.
- Verify Flow: Confirm that water is actually flowing through the sensor. The sensor requires a minimum flow rate of 0.3 L/min to generate pulses.
- Internal Obstruction: If water is flowing but no pulses are detected, the internal turbine might be jammed by debris. Refer to the Maintenance section for cleaning instructions.
6.2 Inaccurate Readings
- Flow Direction: Ensure the sensor is installed with the correct flow direction, aligning with the arrow on the sensor body.
- Stable Flow: Turbulent flow can affect accuracy. Try to install the sensor in a straight section of pipe away from elbows, valves, or pumps.
- Pulse Constant: Double-check your calculation using the pulse constant F = 23 * Q. Ensure your reading device is correctly interpreting the pulse frequency.
- Voltage Stability: Ensure the power supply to the sensor is stable and within the specified voltage range.
7. Warranty and Support
DIGITEN provides a one-year warranty for any product quality problems. If you experience any issues or require technical assistance, please contact DIGITEN customer support through the retailer where you purchased the product or visit the official DIGITEN website for support resources.
For further information or inquiries, please refer to the contact details provided with your purchase or on the DIGITEN brand store page.
