Belt Scale measures Volume instead of weight Task:
A high voltage cable should be layed under the Rhine. The resulting drilling spoil is transported via a belt conveyor. Basically, it is extremely important that the volume of subsidized soil is not greater than the volume of the drilled cylinder. If this exceeds a certain limit, the work must be stopped immediately. The operator of the drilling system wants to use a conventional belt scale for this application. The accumulated weight value (t) should then be converted by a correction factor in m³. This approach only provides satisfactory results, if the density of the soil and the loosening factor are reasonably constant.
Instead of a gravimetric belt scale an optical ”belt scale” was used. This type of scale works with a high-speed scanner, that scans the surface of the belt with optical sensors and thus determines the volume delivered directly and maintenance-free. A robust ”CAT - smartphone” is provided for data exchange and display