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Ultrasonic Fuel Sensor

Ultrasonic Fuel Sensor Installation

Ultrasonic Fuel Level Sensor

By In Blog On December 28, 2015

The ultrasonic fuel level sensor is widely used for vehicle fuel consumption monitoring, optimizing operating cost, and monitoring driver behavior.
ultrasonic fuel sensor

What is an ultrasonic fuel level sensor?

The ultrasonic fuel level sensor is a non-invasive device that does not require contact with the fuel and measures the fuel level in truck fuel tanks or generators. It is easy to install and environmentally friendly compared to other external fuel tank level sensor that needs to drill a hole on the tank before installation.

How does an ultrasonic level sensor work?
ultrasonic fuel level sensor head

The ultrasonic level sensor measures fuel level using ultrasonic waves. The sensor head emits an ultrasonic wave and receives the wave reflected from the monitoring target.

The distance can be calculated with the following formula: Distance L= 1/2 x T x C

Where L is the distance, Tis the time between the emission and reception, and C is the sonic speed. (The value is multiplied by 1/2 because T is the time for the go-and-return distance.)

How accurate are ultrasonic fuel level sensors?

Ultrasonic technology is a very common liquid level sensor whose accuracy depends on the current reading. Ultrasonic sensors use sound waves to detect the liquid level, including fuel , diesel, and water. These liquid level sensors can have a resolution as high as 0.1 mm and an accuracy of 0.1% of the detected range in theory. With software data calibration, the fuel amount left in tank accuracy is above 98%.

What is the maximum range of the ultrasonic sensor?

For ultrasonic sensing, the most widely used range is 40 to 70 kHz. The frequency determines range and resolution. The maximum range of our products is presently 20 meters. At 70 kHz, the measurement resolution is 0.1 mm and the range is up to 20 meters. The default sensor work range is 1 meter.

What should I avoid with ultrasonic level sensors?

  1. Inappropriate application.
  2. Poor mounting angle.
  3. Chemical incompatibility.
  4. Choosing an ultrasonic level sensor with an adequate sensing range.
  5. Not using shielded cable.
  6. Improper cable routing.
  7. Poor quality power source.

How many types of ultrasonic fuel sensors are there?

UniGuard has offered 4 types of different ultrasonic fuel level sensors. As time passed by, we keep improving the device performance and easy the installation process, as well reduce the price to an affordable one.


How much does an ultrasonic fuel level sensor cost?

UniGuard ultrasonic fuel level sensor cost ranges from 55 to 65 USD, very competitive in market. Below is the sensor costs online.

From Year 2024, ultrasonic fuel level sensor supplier by UniGuard cost range is from 45 to 49 USD only. Final price is upto the needed quantity.

Amazon ultrasonic fuel sensor cost

ultrasonic fuel sensor price in amazon

Ebay ultrasonic fuel sensor cost

ultrasonic fuel sensor price in ebay

4th generation ultrasonic fuel sensor Specifications:

Specs Description Remark
Installation Tank bottom () Use glue and bracket
Working Voltage DC12-48V
Working Current ≤ 25mA
Measure Range 46 to 1000 mm Default 100cm. Adjustable.
Measure Resolution 0.1mm
Penetration thickness ≤20 mm
Ex Certification Exia IICT6
Working Temperature -40 to 75 °C
Storage Temperature -45 to 80 °C
Interface RS232/RS485/Analog
Interface baud rate 9600 bit/s Adjustable. 8M wire.
Wire Definition Black-GND, Red-Power

Yellow: 0-5V, connect with GPS speed limiter UT04s Grey wire

Yellow-TX/B, RX/B-connect device.

Green-RX/A, TX/A connect device

Weight 0.45KG

Why should we use an ultrasonic fuel sensor?

The sensor is connected directly to the vehicle battery, therefore it can detect and report a fuel theft in real-time by sending an alert even when the vehicle is switched off.

  • No drilling or modification to the tank is required.
  • Draining of the tank fuel is not required.
  • No parts are placed inside the tank, and No moving parts.
  • No calibration is required by the end-user
  • The device can be removed and placed onto a different tank (no permanent installation).
  • The device can detect the position of the tank.
  • Compartment separators prior to installation. 

How to install an ultrasonic fuel sensor?

The fuel tank level sensor has adhered externally to the bottom of the tank, which connects with an 8.5-meter cable to the GPS tracker 3 main steps are needed:

ultrasonic fuel level sensor installationultrasonic fuel level sensor installation

Step 1: Find a suitable installation position

Step 2: Install the sensor

Step 3: Power on and complete installation.

Below can find a detailed ultrasonic sensor installation manual. 4th Ultrasonic Fuel Sensor Installation Manual V1.2

Click to ultrasonic fuel sensor installation video.

How does the ultrasonic fuel sensor work with GPS Tracker?

Ultrasonic fuel sensor can connect with GPS tracker directly either by analog signal or RS232 or RS485 signal. After connection, sensor shall send reading value to GPS tracker, then GPS tracker sends the data to web tracking software. With proper algorithm and calibration on the software, detailed and accurate fuel left amount shall display on web and APP.

Among all ultrasonic fuel level sensors, UniGuard new sensor performs best, costs competitively and fast easy installation. It works with all kinds of GPS trackers and also GPS speed limiters. Feel fee to contact us now.

Does the ultrasonic fuel level sensor work with Teltonika GPS Tracker?

We have tested our sensor with Teltonika FMB125 GPS Tracker and it works excellently. You can config the sensor on Teltonika computer firmware. Choose the Sensor Model Name UL212.

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