1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your new Stainless Induction Water Level Probes. These probes are designed for use with a liquid level controller to accurately detect water levels in various applications, particularly in plumbing and DIY projects. Please read this manual thoroughly before installation and use to ensure proper function and safety.
Video: Overview of the Stainless Induction Water Level Probes, showing their design and typical appearance.
2. Package Contents
Please verify that all items are present in your package:
- 3 x Stainless Induction Water Liquid Level Probes (with attached wires)

Image: The package includes three water liquid level probes, each with a distinct wire color (red, blue, black) for easy identification during installation.
3. Specifications
| Feature | Specification |
|---|---|
| Model Number | L21C1AA800516 |
| Probe Material | Stainless Steel |
| Wire Length | 2 meters (78.74 inches) |
| DIY Supplies Category | Plumbing |
| Origin | Mainland China |
| Certification | None |
| Battery Included | No |
| High-Concerned Chemical | None |

Image: The probes are shown with their 2-meter wire length, highlighting the stainless steel construction of the probe tip.
4. Installation
These probes are designed to work in conjunction with a liquid level controller (not included). Follow these steps for proper installation:
- Pre-Installation Check: Before proceeding, ensure that the liquid level controller is powered off.
- Wiring Verification: After connecting the probes to your liquid level controller, carefully re-check all input and output wiring connections. Confirm that the probe cables are securely and reliably connected to the controller.
- Probe Placement: It is highly recommended to securely fix each probe to the tank wall at the desired water level detection points. This prevents accidental displacement of the probes, which could lead to malfunctions of the water level controller.
- Metal Tank Considerations: If installing in a metal tank or pool, ensure that the 'C' point (common ground probe) is connected to the tank's ground. Other probes should NOT come into contact with the metal wall to avoid short circuits, which would prevent the controller from functioning correctly.
- Functionality Test: After physical installation, manually move the probes up and down within the tank to simulate water contact. Observe the liquid level controller to confirm it responds as expected and according to your desired operational logic (e.g., turning pumps on/off).

Image: A close-up view of the stainless steel probe tip, emphasizing its robust construction for reliable water level detection.
5. Operation
These probes function as sensors for a liquid level controller. Their operation is directly tied to the controller's settings and capabilities. Generally, after successful installation and wiring:
- Controller Mode: Refer to your liquid level controller's manual. If it has a "manual / automatic" switch (e.g., DF-96D type controllers), ensure it is set to the "automatic" position for continuous water level monitoring.
- Manual Override: If your controller supports manual operation (e.g., to temporarily open or close a valve/pump), use the controller's dedicated manual control switch. Note that some models (like DF-96D) may not have a manual override feature.
- Continuous Monitoring: Once in automatic mode, the probes will continuously detect the water level. The controller will then activate or deactivate connected devices (e.g., pumps, alarms) based on the pre-set high and low water level thresholds defined by the probe placements.
6. Maintenance
To ensure the longevity and accurate performance of your water level probes, follow these maintenance guidelines:
- Regular Cleaning: Periodically inspect the stainless steel probe tips for any buildup of scale, algae, or other debris, especially in hard water or dirty environments. Clean gently with a soft brush and mild detergent if necessary.
- Wire Inspection: Check the probe wires for any signs of wear, fraying, or damage. Ensure connections to the liquid level controller remain secure.
- Probe Position: Verify that the probes remain firmly fixed in their intended positions on the tank wall. Adjust if any displacement is observed.
- Environmental Avoidance: Do not install or operate the product in excessively humid, corrosive, or high metal content gas environments, as this can lead to malfunction and premature failure.
7. Troubleshooting
If you encounter issues with your water level probes, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller not responding to water level changes. |
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| Inaccurate water level readings. |
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| Controller constantly triggers or fails to trigger. |
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8. User Tips
No specific user tips or common questions were available from customer reviews or Q&A for this product at this time. However, general advice for water level probes includes:
- Always ensure a good electrical connection for reliable readings.
- Consider using waterproof sealant around wire entry points if the probes are submerged in a harsh environment.
- For critical applications, regularly test the system to ensure it functions as intended.
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your liquid level controller or contact the seller directly. Keep your purchase receipt as proof of purchase.