A pressure sensor is installed at the top of the device and evaluates the level of liquid in the tank. On tanks that have an internal pressure fluctuations (e.g., poor ventilation or fluid back flow), over-pressurization may take place that will affect the measurement. To compensate for this, a second pressure sensor monitors the internal tank air pressure and calculates this internally.  The internal communication through the data BUS calculates both measured values and a precise measuring result, independent of the surrounding pressure, is transferred to the device.

Using this measuring method, it is possible to achieve precise measurements under heavy-duty operation. Susceptible mechanics are excluded.