1. Product Overview
This compact G1/4" liquid water flow sensor is designed to detect the flow of water in various applications, including water dispensers, purifiers, and vending machines. It operates on a simple magnetic displacement principle, activating a reed switch when water flows through it.
Video: A 360-degree view of the G1/4" water flow sensor, showcasing its compact design and connection points.
Image: The water flow sensor, illustrating the 'IN' and 'OUT' ports and the 2-point quick connection mechanism.
Image: Top-down view of the water flow sensor, highlighting the directional 'IN' and 'OUT' markings.
Image: Bottom view of the sensor, indicating the internal flow direction with an arrow.
2. Features
- Magnetic Displacement Principle: When water flows, it displaces a magnet, which in turn activates a reed switch. When flow stops, the magnet returns to its original position, disconnecting the switch.
- Compact and Lightweight: Designed for easy integration into various systems.
- Stable Performance: Ensures reliable flow detection.
- Low Startup Flow: Activates at a minimum flow rate of 300ml/min.
- Easy Installation: Features G1/4" thread and 2-point quick connections.
- Durable Construction: Made from high-quality plastic for long-lasting use.
- Normally Open Switch: The switch is open when there is no flow and closes when flow is detected.
3. Specifications
| Attribute | Value |
|---|---|
| Material | Plastic |
| Body Size (approx.) | 6.2 x 2.8 x 1.6 cm (2.4 x 1 x 0.63 in) |
| Applicable Water Quality | Turbidity < 1; Fe, Co & Ni < 0.3 Mg/L |
| Applicable Water Pressure | ≤ 0.8 MPa |
| Applicable Water Temperature | 5 ~ 50°C |
| Ambient Humidity | ≤ 85% |
| Storage Temperature | -20 ~ 50°C |
| Thread | G1/4" |
| Startup Flow | 300 ml/min |
| Response Time | ≤ 1 second |
| Switch Type | Normally Open |
| Length of Wire | 50 cm |
| Hydrostatic Pressure | Open at 1.05 MPa for 5 minutes (no leakage or damage) |
| Voltage Resistance | DC160V for 1 min or DC200V for 1 sec (between live and non-live parts) |
| Maximum Closing Current | 0.5 A |
| Maximum Load Current | 1 A |
| On Resistance | 0.12 Ω |
| Disconnect Resistance | 10120 Ω |
| Power Connection Capacity | 0.2 PF |
Image: Detailed dimensional drawing of the water flow sensor.
4. Setup
- Identify Flow Direction: Locate the 'IN' and 'OUT' markings on the sensor body. Ensure the sensor is installed in the correct direction of water flow. An arrow indicating flow direction may also be present on the underside.
- Connect Water Lines: Use the G1/4" threaded connections or the 2-point quick connections to integrate the sensor into your water system. Ensure all connections are secure and watertight to prevent leaks.
- Wiring: The sensor has a 50cm wire with a connector. Connect this to your control circuit. As a 'Normally Open' switch, the circuit will be open (no signal) when there is no water flow, and it will close (signal detected) when water flows. Refer to your system's wiring diagram for proper integration.
- Mounting: Secure the sensor in place using the integrated mounting points and screws, if necessary, to prevent movement or strain on the connections.
5. Operating Instructions
The water flow sensor operates automatically based on the presence or absence of liquid flow. Once installed and wired correctly:
- When water flows through the sensor at or above the startup flow rate (300ml/min), the internal magnet is displaced, causing the reed switch to close. This completes the electrical circuit, sending a signal to your connected device (e.g., water dispenser controller).
- When water flow stops or drops below the startup flow rate, the magnet returns to its resting position due to spring thrust, opening the reed switch. This breaks the electrical circuit, indicating no flow.
The response time for flow detection is less than 1 second.
6. Maintenance
To ensure optimal performance and longevity of your water flow sensor, follow these maintenance guidelines:
- Regular Inspection: Periodically check the sensor and its connections for any signs of wear, damage, or leaks.
- Water Quality: Ensure the water flowing through the sensor meets the specified quality standards (turbidity < 1; Fe, Co & Ni < 0.3 Mg/L). Poor water quality can lead to sediment buildup and affect sensor accuracy or cause blockages.
- Cleaning: If sediment buildup is suspected, carefully disconnect the sensor and flush it with clean water. Avoid using harsh chemicals or abrasive materials that could damage the plastic body or internal components.
- Storage: If the sensor is to be stored for an extended period, ensure it is clean, dry, and kept within the specified storage temperature range (-20~50°C).
7. Troubleshooting
- No Flow Detected (but water is flowing):
- Check if the sensor is installed in the correct flow direction ('IN' and 'OUT' markings).
- Verify that the water flow rate meets or exceeds the startup flow of 300ml/min.
- Inspect for any blockages within the sensor or connected pipes.
- Ensure the wiring connections are secure and correct.
- Constant Flow Detected (but water is not flowing):
- Check if the sensor is stuck in the 'closed' position due to debris or mechanical issue.
- Verify the wiring for any short circuits.
- Leakage at Connections:
- Ensure all G1/4" threads are properly sealed with PTFE tape or appropriate sealant.
- Check quick connections for proper seating and O-ring integrity.
8. User Tips
- Voltage Clarification: This device is a passive flow switch, not a power-consuming electrical appliance. It does not 'handle' operating voltage in the same way a motor or light bulb does. Instead, it acts as a switch within a low-voltage control circuit. The 'Voltage Resistance' specification refers to the insulation capability between its internal components and external parts, ensuring safety when integrated into a circuit, not its operating voltage. It is designed to switch a circuit with a maximum load current of 1A.
- Installation Direction is Crucial: Always double-check the 'IN' and 'OUT' markings and any flow arrows to ensure correct installation. Incorrect orientation will prevent proper operation.
- Pre-filter for Longevity: If your water source has high particulate matter, consider installing a pre-filter to prevent debris from entering and potentially clogging the flow sensor.
9. Warranty and Support
For any questions, technical assistance, or warranty claims, please contact the seller or manufacturer directly. Keep your purchase records for reference.