VEGAPULS: Contactless measurement under arduous process conditions

Measuring principle
Extremely short microwave impulses are emitted by the antenna system to the measured product, reflected by the product surface and received again by the antenna system. They spread with light velocity and the time from emission to reception of the signals is proportional to the level in the vessel. A special time spreading procedure enables the reliable and precise measurement of the extremely short times. The radar sensors work with low emitted power in the C and K-band frequency range. The proven ECHOFOX signal processing selects the correct level echo reliably from a number of false reflections. An adjustment with empty and full vessel is not necessary.

Applications in liquids
Two different emitting frequencies are available for these applications. The compact, high frequency sensors are particularly suitable for applications for which high accuracy is required. Even with small antenna sizes, an excellent signal focusing is reached. Low frequency C-band sensors can penetrate foam and strong condensation and are thus particularly suitable for arduous process conditions. Unaffected by steam, gas composition, pressure and temperature changes the sensors detect the product surface of different products reliably.

Applications in bulk solids
High frequency sensors in K-band technology are used for these applications. Thanks to the very good focusing of the signals, the influences of silo installations or buildup on the vessel wall are gated out. A high sensitivity electronics adapted to the requirements of the bulk solids measurement, enables a reliable level measurement of different products up to 70 m. The measuring principle is unaffected by strong dust generation, filling noise, air turbulence by pneumatic filling and temperature fluctuations. The application area covers applications in the food processing industry and the plastic processing up to the steel generation.

VEGAPULS 61