Tenet UL212 Wireless Ultrasonic Fuel Level Sensor

1. Introduction

The Tenet UL212 is an advanced, all-in-one wireless ultrasonic fuel level sensor designed for efficient fleet fuel monitoring. This non-contact sensor provides high-accuracy liquid level detection without the need for drilling holes in the fuel tank, making installation easy and preserving tank integrity. It supports various liquid types and tank materials, offering robust performance for diverse applications in trucks, excavators, and other vehicles.

Figure 1: Tenet UL212 Wireless Ultrasonic Fuel Level Sensor

2. Features and Specifications

2.1 Key Features

• Non-Contact Installation: No drilling holes in the tank, ensuring easy installation and maintaining tank integrity.
• Universal Liquid Compatibility: Supports various liquids including Diesel, Gasoline, Water, LPG, Adblue, etc.
• Versatile Tank Material Support: Compatible with metal, aluminum, stainless steel, fiber, and plastic tanks.
• High Accuracy: Provides 99.5% accuracy with a resolution of 0.1mm.
• Multiple Output Interfaces: Features BLE Bluetooth 5.0, RS232 (default), RS485, and Analog (0~5V) outputs.
• Mobile App Configuration: Allows for easy configuration and calibration via a mobile application.
• Advanced Algorithm: Built-in AI algorithm to filter abnormal signals for stable readings.
• Fuel Theft Alarm: Includes I/O output for fuel theft alarm integration.
• Durable Design: IP67 waterproof rating for reliable outdoor use.

2.2 Technical Specifications

3. Package Contents

Please check the package contents upon receipt to ensure all items are present:

• UL212 Wireless Ultrasonic Fuel Level Sensor
• Stainless Steel Strap
• Short Straps (Cable Ties)
• 3M Adhesive Pads
• Sandpaper
• Strap Key
• Silicone Gel

Figure 2: Included components with the UL212 sensor

4. Setup and Installation

The UL212 sensor is designed for easy, non-invasive installation. Follow these steps carefully:

4.1 Choosing the Installation Position

Select the best position on the bottom of the fuel tank for installation. Avoid areas with internal tank components like original tank compartments, fuel tube float ranges, or refueling ports. The ideal position is typically a flat, clean area on the tank bottom.

Figure 3: Installation diagram showing best position and epoxy glue application

4.2 Surface Preparation

1. Clean the chosen installation area on the outside bottom of the fuel tank thoroughly.
2. Use the provided sandpaper to lightly abrade the surface. This helps ensure strong adhesion.
3. Wipe away any dust or debris.

4.3 Sensor Attachment

4. Apply the 3M adhesive pad to the sensor's contact surface.
5. Mix the two components of the AB Epoxy Glue for 20-30 seconds until thoroughly combined.
6. Inject the mixed AB Epoxy Glue onto the sensor's contact surface, covering the 3M pad.
7. Firmly press the sensor onto the prepared tank surface.
8. Use the stainless steel strap and short straps (cable ties) to further secure the sensor to the tank, ensuring a tight fit.

Figure 4: Example installation on a truck fuel tank

Figure 5: Example installation on an excavator fuel tank

4.4 Wiring Connections

Connect the sensor to your GPS tracker or Mobile DVR according to the wiring diagram below:

Figure 6: UL212 Wiring Diagram

• Black Wire: GND (Ground)
• Red Wire: +12/24V DC (Power Supply, with 1A Fuse)
• Yellow Wire: RS232_TX / RS485_B
• Green Wire: Analog_Output (0-5V)
• White Wire: RS232_RX / RS485_A

4.5 Installation Verification

After installation, verify successful setup using the mobile app and the sensor's indicator light:

Figure 7: Installation verification using indicator light and mobile app

• Indicator Light: The probe should show a stable GREEN light. If it flashes red, you need to hold and recheck the position.
• Mobile App Status: Ensure the mobile app displays the following:
  • Real Time & Smooth Value are stable and close to the real height.
  • Signal Strength is more than 10 or stable.
  • Valid Signal Quantity is stable, more than 20.
  • Tilt Angle is less than 11 Degrees.

5. Operating Instructions

The UL212 sensor operates by detecting fuel level height using an ultrasonic probe. It processes the height signal through its built-in program and transmits the data via BLE Bluetooth, RS232, RS485, or Analog output to a connected GPS Tracker or Mobile DVR. This data is then sent to a monitoring platform for analysis and reporting.

Figure 8: Diagram illustrating how the UL212 sensor works

5.1 Mobile App Usage

The UL212 mobile application allows for configuration, calibration, and diagnostics:

Figure 9: UL212 Mobile App interface for configuration and diagnostics

• Configure Volume Parameter: Set up tank dimensions and shapes for accurate volume calculation.
• Rename Sensor ID: Assign a unique identifier to each sensor.
• Configure Temperature Compensation: Adjust for different liquid types to maintain accuracy.
• Change Protocol: Select the appropriate communication protocol (RS232/RS485) to fit your tracking device (GPS tracker/DVR).
• Diagnostic Sensor: Perform diagnostics before and after installation to ensure optimal performance.

5.2 Fuel Monitoring and Alerting

The sensor, when integrated with a GPS tracker or Mobile DVR, can provide real-time data to a monitoring platform. This enables:

• Real-time Fuel Level: Continuous monitoring of fuel levels.
• Fuel Theft Detection: The system can detect sudden drops in fuel level, especially when the ignition is off or the vehicle is stationary.
• Refueling Identification: Sudden increases in fuel level indicate refueling events.

Figure 10: Graph illustrating fuel theft detection (sudden drop)

Figure 11: Graph illustrating refueling detection (sudden increase)

6. Maintenance

The UL212 sensor is designed for low maintenance. However, regular checks can ensure its longevity and accurate performance:

• Keep Clean: Periodically inspect the sensor's surface for dirt, grime, or debris buildup. Clean gently with a soft cloth if necessary.
• Check Connections: Ensure all wiring connections remain secure and free from corrosion.
• Adhesion Check: Occasionally check the sensor's adhesion to the tank. If it appears loose, re-secure it following the installation steps.
• Software Updates: Check for any available firmware or mobile app updates from the manufacturer to ensure optimal performance and access to new features.

7. Troubleshooting

If you encounter issues with your UL212 sensor, refer to the following common problems and solutions:

7.1 Common Issues and Solutions

• Sensor Indicator Light Flashes Red:
  Problem: Indicates an unstable signal or improper installation position.
  Solution: Recheck the sensor's position on the tank. Ensure it's on a flat surface, away from internal tank components, and that the adhesive is firm. Use the mobile app to verify signal strength and tilt angle.
• Inaccurate or Unstable Readings in Mobile App:
  Problem: Readings are fluctuating or do not match actual fuel levels.
  Solution:
  
  1. Verify the sensor's installation position and adhesion.
  2. Check the 'Signal Strength' and 'Valid Signal Quantity' in the mobile app. These should be stable and above recommended thresholds (Signal Strength > 10, Valid Signal Quantity > 20).
  3. Ensure the 'Tilt Angle' is less than 11 degrees.
  4. Recalibrate the sensor using the mobile app, ensuring correct tank parameters are entered.
  5. Check for any obstructions or excessive buildup on the tank surface where the sensor is attached.
• No Data Output to GPS Tracker/Mobile DVR:
  Problem: The connected tracking device is not receiving data from the sensor.
  Solution:
  
  1. Check all wiring connections (GND, Power, RS232/RS485, Analog Output) for proper seating and continuity.
  2. Ensure the sensor is powered correctly (9-80V DC).
  3. Verify that the communication protocol (RS232/RS485) configured in the mobile app matches the input protocol of your GPS tracker/Mobile DVR.
  4. Confirm that the GPS tracker/Mobile DVR is correctly configured to read data from the sensor.
• Fuel Theft Alarm Not Triggering:
  Problem: Fuel theft occurs but no alarm is generated.
  Solution:
  
  1. Ensure the I/O output for the alarm is correctly wired and configured with your tracking system.
  2. Check the alarm thresholds and logic within your monitoring platform or GPS tracker settings.
  3. Verify that the sensor is providing accurate and real-time data to the platform.

8. User Tips

• Optimal Adhesion: For the best and most durable installation, ensure the tank surface is thoroughly cleaned and lightly sanded before applying the 3M pad and epoxy glue. This maximizes the bond strength.
• Initial Calibration is Key: Always perform the initial calibration using the mobile app after installation. Accurately inputting tank dimensions and liquid type will significantly improve the precision of fuel level readings.
• Regular Data Review: Periodically review your fuel monitoring data for patterns. This can help identify not only fuel theft but also inefficient driving habits or potential engine issues affecting fuel consumption.
• Temperature Compensation: If monitoring different types of liquids or operating in environments with significant temperature fluctuations, utilize the mobile app's temperature compensation feature for consistent accuracy.

9. Warranty and Support

9.1 Product Warranty

The Tenet UL212 Wireless Ultrasonic Fuel Level Sensor comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or improper installation.

9.2 Technical Support

For technical assistance, troubleshooting, or warranty claims, please contact Tenet Auto Electronics Limited directly. Refer to the contact information provided with your purchase or visit the official Tenet website for support resources.

10. Certifications

The Tenet UL212 sensor complies with international standards and holds the following certifications:

• FCC Certified: Certified by the Federal Communications Commission (FCC) for electromagnetic compatibility in the US.
• CE Certified: Conforms with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA).
• RoHS Compliant: Complies with the Restriction of Hazardous Substances Directive, limiting the use of specific hazardous materials in electronic and electrical products.

Figure 12: FCC Grant of Equipment Authorization for UL212

11. About Tenet Auto Electronics Limited

TENET AUTO ELECTRONICS LIMITED is a leading designer and manufacturer of automotive meters and sensors. With extensive experience as an OEM&ODM supplier of Auto Meters, Instrument Clusters, Truck Gauges, and Auto Sensors, Tenet is committed to innovation, quality control, and excellent after-sales service. As an IATF member, Tenet actively keeps pace with rapid advancements in the automotive electronics field.

Figure 13: Tenet Auto Electronics Limited manufacturing facility