New Radar Level Measuring Instrument Focuses on the Essential

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A radar sensor can only measure the right level if a clear level echo is available. The following applies especially for bulk solids: If the interference signals are the same size as the level echo, a reliable measurement is impossible. Therefore the focusing is crucial for an accurate measurement. All applications which previously returned very small reflections, such as plastic pellets with very low dielectric figures, benefit from this.

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Plastic powders or pellets are usually stored in high, very slim containers. Circumferential welds, even if they are only a few millimetres wide, repeatedly cause interference reflections in silos. In the worst case, there is such a weld every 50 cm which can conceal the actual useful signal. It had always been difficult, especially with plastic powders with poor reflection properties, to filter out the right signal. In some cases large parabolic antennas had to be used to achieve good focusing and to reduce the interference signals.

Another application which benefits particularly from the narrow opening angle is the measurement in segmented containers or mixing silos in the cement and building materials industry. These mixing silos have trapezoidal plates as partitions. In comparison with the bulk solids, these plates cause very heavy interference signals which previously had to be processed at great effort with very complex evaluation algorithms. The better focusing now leads to more accurate and above all safe measuring results.

But uncomplicated applications also benefit from this because a greater measuring certainty is ensured over the entire measuring range. Commissioning has also become much easier and more convenient.

Higher Dynamics

The dynamic range in radar sensors makes a statement about which areas of application a sensor can be used in, i.e. the difference between the largest and the smallest signal. The greater the dynamics, the wider the range of application of the sensors.

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