Keeping production in laboratories free of germs and contamination is not easy. Particularly problematic is the equipment used, for example test tubes, Petri dishes as well as measuring devices such as scales. They are brought into the screened working space from outside and can introduce germs. If they are put down on the work surface, tiny gaps are created underneath them and these are very difficult to keep clean.
These requirements can be easily met in the future by using magnetic-field-based levitation technology, e.g. with superconductor technology. The SupraSensor concept from Festo is just one of the options. It demonstrates the function of contactless scales that could, for example, be used on safety workbenches for biological or chemical analytics.
At the heart of the application is a cryostat with a superconductor that is permanently mounted on a set of precision scales under the work area. A weighing dish levitates above the area with a permanent magnet on the underside, which is coupled contactlessly to the superconductor and thus also to the scale. This is made possible by the special characteristic of superconductors that can make magnets levitate at a specific distance when they are cooled to a certain temperature.