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Radar Level Measuring

New Radar Level Measuring Instrument Focuses on the Essential

| Author / Editor: Jürgen Skowaisa / Dr. Jörg Kempf

An application which benefits particularly from the narrow opening angle of the Vegapuls 69 is the measurement in segmented containers or mixing silos which have trapezoidal plates as partitions. In comparison with the bulk solids, these plates cause very heavy interference signals. The better focusing now leads to more accurate and above all safe measuring results.
An application which benefits particularly from the narrow opening angle of the Vegapuls 69 is the measurement in segmented containers or mixing silos which have trapezoidal plates as partitions. In comparison with the bulk solids, these plates cause very heavy interference signals. The better focusing now leads to more accurate and above all safe measuring results. (Picture: Vega)

Radar level measuring instruments have written a success story. The areas of application were gradually extended. However, according to the unanimous opinion of the experts, a measuring instrument that really covers all applications had not yet been sighted. Thanks to the higher frequency ranges and new instrument versions, a new instrument comes very close to this ideal.

Does the bulk solids world really need a new radar measuring instrument? The answer is “yes”. Although we can cover a large part of the bulk solids sector, there are still applications in which better focusing or a greater dynamic range would be an advantage. If the technical possibilities exist, it is logical to exploit them to offer users a further possibility to solve their respective complex level applications. With the Vegapuls 69 Vega is adding a further piece to the radar technology application area.

The Vegapuls 69 comes a good deal closer to the ideal of an all-round radar measuring instrument for bulk solids. It operates with a frequency of 79 GHz. This enables a much higher focusing of the transmission signal. Especially in vessels with many installations, the good focusing helps to achieve better separation of the actual measuring signal from interference signals.

With new microwave components, even the slightest reflection signals can be measured. Products with poor reflection properties which were previously difficult to measure, such as plastic powders or wood chips, can now be measured reliably.

Furthermore, the Veagpuls 69 features a much wider range of application. With a measuring range up to 120 m and an accuracy of ±5 mm it has enough power reserves even for unusual assignments such as in mine shafts or for distance measurement in conveyor systems.

The opening angle of the radiated radar energy and therefore the focusing depends on two factors: the transmission frequency and the active antenna area. This means that a much better focusing is achieved at a higher frequency with the same antenna size. The Vegapuls 69 operates with a transmission frequency of approximately 79 GHz and an antenna size of 75 mm. This achieves an opening angle of only 4°. In a radar sensor with 26 GHz transmission frequency the opening angle is about 10° with the same antenna size. The 79 GHz beam misses installations or deposits on the vessel wall and makes the measurement more accurate and reliable.

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