1. Introduction
The RYSJM UL212-F is an advanced ultrasonic non-contact liquid level sensor designed for accurate and reliable fuel or liquid level detection without requiring any drilling into the tank. Utilizing ultrasonic technology, it provides real-time data for various applications, including fuel gauges in vehicles, boats, and generators. This manual provides comprehensive instructions for installation, operation, maintenance, and troubleshooting to ensure optimal performance of your UL212-F sensor.
Video 1: UL212-F Ultrasonic Fuel Sensor Product Overview and Unboxing
2. Package Contents
Please verify that all items listed below are included in your package:
- 1 x UL212-F Ultrasonic Sensor Unit
- 1 x Control Box (Signal Converter)
- 1 x Connection Cable (approx. 9 meters) with inline fuse
- 1 x Metal Clamp (for sensor mounting)
- 1 x Key (for calibration screw adjustment)
- 1 x Sandpaper (for surface preparation)
- 2 x AB Epoxy Glue (for sensor adhesion)
- Heat Shrink Tubes
- Zip Ties
- Instruction Manual (this document)
Figure 1: Complete UL212-F Sensor Kit Components
3. Specifications
| Feature | Specification |
|---|---|
| Model | UL212-F |
| Power Supply | 9~36V DC |
| Max Power Consumption | 0.7W @12V DC |
| Measuring Range | 3~250cm |
| Resolution | 0.1mm |
| Accuracy | 99.5% (for 0# Diesel or 95# Gasoline at 25℃) |
| Lowest Detection Height (Blind Area) | 3cm |
| Maximum Tank Thickness | <12mm |
| Extension Cable Length | 9 meters |
| Working Temperature | -40~85℃ |
| Working Humidity | 5~99% |
| Explosion-proof Class | Exd II CT5 |
| Material | Plastic Shell |
| Item Weight | 1000g |
| Item Dimensions (Height x Width) | 52mm x 52mm |
4. Setup and Installation
4.1 Physical Installation
The UL212-F sensor is designed for non-contact installation on the exterior bottom of the liquid tank. Proper placement is crucial for accurate readings.
- Identify Best Position: Locate a flat, clean area on the bottom of the tank, away from any internal tank compartments (A, B), the original tank fuel tube float range (C), or the refueling port (D). Position 'E' in Figure 2 indicates the best installation spot.
- Prepare Surface: Use the provided sandpaper to thoroughly clean and roughen the chosen installation area on the tank's exterior. Ensure the surface is free of dirt, oil, and rust.
- Apply Epoxy Glue: Mix the two components of the AB Epoxy Glue for 20-30 seconds as shown in Figure 3.
- Attach Sensor: Apply the mixed epoxy glue to the bottom of the sensor probe. Firmly press the sensor onto the prepared tank surface. Ensure a strong, bubble-free bond.
- Secure Sensor (Optional): For added security, use the metal clamp around the sensor and tank, if applicable, to hold it in place while the glue cures.
Figure 2: Ultrasonic Fuel Level Sensor Installation Positions
Figure 3: Applying AB Epoxy Glue and Sensor Attachment
4.2 Wiring Connection
Connect the UL212-F sensor to your vehicle's power supply and fuel gauge according to the following diagram:
- Red Wire: Connect to Power + (DC9~36V)
- Black Wire: Connect to Power Ground
- Brown Wire: Connect to Output to Fuel Gauge
- Yellow Wire: (Optional, for specific models/features)
- Green Wire: (Optional, for specific models/features)
Figure 4: UL212-F Wiring Diagram
Figure 5: Control Box Internal Components (Calibration Screw and Buttons)
5. Operation
5.1 Mobile App Configuration & Diagnostics
After physical installation and wiring, use the dedicated mobile application (available on Android and iOS) to approve the installation and perform diagnostics.
- Download the "UL212 Fuel" app from Google Play Store or Apple App Store.
- Open the app and connect to the UL212-F sensor via Bluetooth.
- Verify the installation status:
- The probe's LED should show a stable GREEN light. If it flashes red, recheck the sensor position.
- The mobile app should display the following stable status readings (refer to Figure 6):
- Real Time Height & Smooth Value: Stable and close to the actual liquid height.
- Signal Strength: More than 10 or stable.
- Valid Signal Quantity: Stable, more than 20.
- Tilt Angle: Less than 11 Degrees.
Figure 6: Mobile App Diagnostic Interface
Figure 7: Installation Approval Criteria
5.2 Programming Ohm Signal Output (Calibration)
To ensure the sensor output matches your original fuel gauge, perform the following calibration steps using the buttons (E, H, F) and calibration screw on the control box (refer to Figure 5 for button locations):
- Full Tank Calibration:
- Refuel the tank to its full capacity.
- Power on the UL212-F.
- Press and hold button 'F' (Full).
- While holding 'F', restart the power of the UL212-F.
- Release button 'F' once the RED LED stays on.
- Read and record the fuel maximum height (e.g., 400mm) using the mobile app.
- Adjust the calibration screw (clockwise or anti-clockwise) until your fuel gauge shows "Full".
- Press button 'F' once to save the "Full" signal.
- Half Tank Calibration:
- Decrease the fuel level to approximately half height (e.g., 200mm).
- Adjust the calibration screw until your fuel gauge shows "1/2" (Half).
- Press button 'H' (Half) once to save the "Half" signal.
- Empty Tank Calibration:
- Decrease the fuel level to show around 30-35mm.
- Adjust the calibration screw until your fuel gauge shows "Empty".
- Press button 'E' (Empty) once to save the "Empty" signal.
Figure 8: Ohm Signal Output Programming Flowchart
6. Maintenance
The UL212-F sensor is designed for low maintenance. Follow these guidelines to ensure its longevity and accurate performance:
- Keep Sensor Clean: Periodically inspect the exterior of the sensor and the tank surface where it's mounted. Clean any accumulated dirt or debris that might interfere with ultrasonic signals.
- Check Wiring: Ensure all wiring connections remain secure and free from corrosion or damage.
- Software Updates: Check the mobile application periodically for any available firmware updates for the sensor, which may improve performance or add features.
7. Troubleshooting
If you encounter issues with your UL212-F sensor, refer to the following troubleshooting tips:
| Problem | Possible Cause | Solution |
|---|---|---|
| No reading or incorrect readings on fuel gauge. |
|
|
| Probe LED flashes red. | Poor signal reception due to improper installation position. | Recheck sensor position on the tank, ensuring it's on a flat, clean area away from obstructions (Figure 2). |
| Mobile app shows unstable or low signal strength/quantity. | Suboptimal sensor placement or adhesion. | Ensure the sensor is firmly attached with no air gaps and is in an optimal position (Figure 2, Figure 3, Figure 7). |
| Fuel gauge reading is inconsistent after calibration. | Calibration points are not accurately set. | Repeat the programming/calibration steps carefully (Section 5.2). Ensure the tank is stable during calibration. |
8. User Tips
- The UL212-F sensor is designed for outer adhering, non-contact liquid level detection, making installation simpler and safer as it avoids drilling into the tank.
- For best results, ensure the tank surface is completely clean and dry before applying the epoxy glue.
- When calibrating, try to perform the steps with the vehicle or tank in a level position to maximize accuracy.
9. Frequently Asked Questions (FAQ)
- Q: How can I utilize this item?
- A: The UL212-F sensor can be utilized for outer adhering, non-contact liquid level detection in various tanks, including those for diesel, gasoline, and water. It's compatible with different tank materials like metal, aluminum, stainless steel, fiber, and plastic.
- Q: Do I need to drill holes in my tank for installation?
- A: No, the UL212-F is a non-contact sensor and does not require any drilling into your tank, simplifying installation and reducing the risk of leaks.
- Q: What kind of liquids can this sensor detect?
- A: It supports detection for various liquids including diesel, gasoline, and water.
10. Warranty and Support
For technical assistance, warranty claims, or further inquiries, please contact RYSJM Car Parts Store directly through the platform where you purchased the product. Ensure you have your purchase details and product model number (UL212-F) ready when contacting support.
The manufacturer provides an AI algorithm built into the sensor to filter abnormal signals, ensuring stable and accurate readings. Regular checks via the mobile app can help monitor sensor health.
