Point level detection with microwave barriers
The microwave barrier functions like a light barrier: when the medium gets in the way of the microwave beam between the transmitter and the receiver, the signal is attenuated. This signal attenuation is detected by the receiver and converted into a switching signal.
In addition, microwaves are able to penetrate non-conductive materials. This means: with containers made of plastic or glass it is possible to measure right through the container walls.
Another useful application is object monitoring, e.g. detecting the position of trucks that are being loaded, or preventing crane collisions.
The advantages
Point level detection with microwave barriers operates contactlessly and is not affected by soiling – both in solids and in liquids. This ensures wear and maintenance free operation.
Measuring principle
The measuring system consists of a microwave emitter and a respective receiver. An emitting signal with a frequency of 24 GHz is focussed by an antenna system and emitted against the receiver. A medium in the path of rays damps this signal. This signal damping is detected by the receiver and converted into a switching signal. The adaption to the local conditions and the medium is easily possible by adjusting the sensitivity. Because microwaves can penetrate non-conductive products, a measurement through plastic vessels is possible. With metal vessels, mounting is carried out directly on the vessel or through suitable window materials such as for example plastic, glass or ceramic.
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