Precise measurement of fuel level in trucks and railway vehicles

It allows for continuous measurement of fuel levels (diesel, bio-diesel and oils). Fuel level meters can also be installed in stationary tanks, reservoirs, wells, etc.

  • High endurance of the level meter, absence of moving parts
  • Simple installation and the possibility to cut the length of the level meter during installation
  • High measurement accuracy (respecting the dielectric properties of a medium, the tilt and the acceleration of the vehicle)
  • Possibility to connect the level meters to network (multi-tank solutions)
  • Theft alarm output
  • Energy saving mode
  • Error diagnostics
  • Remote firmware replay




Components of the fuel level meter

Components of the fuel level meter

The fuel level meter is a structural unit comprising:

  • capacitive sensing probe (sensing the level of a medium)
  • sliding capacitive compensation sensor (measurement of dielectric properties of a medium and its temperature)       
  • transmitter head with integrated electronics

Measured and evaluated data about the current level of the monitored media is sent for further processing to supervisory systems via RS485, RS232, CAN, 0 to 15V outputs.

We manufacture these systems in two versions:

  • LM1.2 - application for road vehicles
  • LM2.2 - application for railway vehicles

Measuring principle

Measuring principle

The sensing electrode consists of a system of coaxial tubes creating a capacitor, whose dielectric is measured fuel (or another medium). The standard lengths of capacitive probes are 1.2 m, 1 m, 0.7 m and 0.4 m. The system of coaxial tubes of the probe is firmly attached to the transmitter head. The capacity value of the capacitor created in this way is the function of the height of flooding of the sensing electrode with the medium to be measured. 

The tubular subsystem of the compensation sensor used for measuring dielectric properties of measured fuel is attached to the lower part of the main tubular system. The advantage of the level meter is the fact that the user may shorten the length of the sensing probe according to the type of the tank directly at the site of installation.

The electronic circuits correct the information on the instant fuel level in the tank pursuant to variations in dielectric properties of  measured fuel (switching from diesel fuel to biodiesel has no effect on accuracy). The resulting level value is transmitted via the RS485, RS232, CAN line or the analogue output to be processed further in superior systems. The changes in levels are evaluated as variations in the volume of fuel in the tanks according to a calibration curve characterizing the appropriate tank. The calibration curve for a tank can be created by means of the fuel level meter, which makes it possible to use it as a fuel consumption gauge.

The output signals from the transmitter head are brought out by a cable with anticipated connection to a terminal board or to a connector of the superior system. By agreement with the manufacturer, the level meter cable can be terminated with a defined connector.

Level meter installation

Level meter installation

They are installed vertically in the upper sections of fuel tanks. They are installed by fitting the transmitter flange into an opening in the fuel tank (diameter for inserting level meter is 30mm). The fitting method adheres to the SAE 5 standard.

The Webdispatching application makes it possible to monitor fuel consumption and fuel amounts in the vehicle fuel tanks. It is possible to compare this data with the pre-set allowed consumption or refuelling records.

The WEBDISPATCHING product is a shared project of Princip a.s. and HI Software Development s.r.o. This project boasts a unique combination of high-end hardware solutions and comprehensive software superstructures.

More about the WEBDISPATCHING application