The system of antennas emits a very short microwave pulses and takes them as echoes reflected from the surface of the measured product. Microwave pulse travels at the speed of light, and the time from emission to reception of the signals is proportional to the level in the capacity. The reliability and accuracy of such extremely brief periods is provided by a special procedure of stretching the pulse in time. Radar sensors operate with low radiated power in the frequency range 6 GHz, 26 GHz or 80 ГГц. Separation of the useful echo signal provided by the proven technology ECHOFOX.

There is the possibility of measuring through a closed top plastic containers. There are modifications of these sensors without focusing antenna for measuring in the casing , and sensors with integrated hollow waveguide tube for the measurement of fluids with a very low dielectric constant. For particularly extreme conditions sensors are available with Teflon- coated and ceramic- graphite sealing.