Based on an FMCW radar signal, the level meter transmits a high frequency signal which increases linearly during the measurement phase. The signal is emitted, reflected on the measuring surface and received with a time delay, t (t=2d/c, where d is the distance to the product surface and c is the speed of light in the gas above the product). For further signal processing, the difference is calculated from the actual transmission frequency and the received frequency and is directly proportional to the distance.
The level meter comes with an optional second current output that can be used for displaying measurements such as volume. In addition, it offers a wide variety of open (horn) and closed (drop) antenna configurations that can easily be interchanged by the user.