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Filling level monitoring in sticky products

MOLOSroto level switch with annular gap flushing

It is a very difficult task for measurement devices to monitor the filling level in hoppers and bins filled with sticky and adhesive materials. For example, in batch mixer or homogenizer, that are often pre- or post-mounted to the batch mixers, liquids such as molasses, oils or fats are often added to the dry bulk solids during the manufacturing process for different products. After the metering of these liquids the adhesive forces of the mixture increase significantly. Therefore, the level indicators in the following bins and hoppers have problems with caking and significant soiling and often supply no more reliable measuring results.


For this kind of applications MOLLET Füllstandtechnik developed a special problem solving. The anyway very robust and insensitive rotary paddle devices of the MOLOSroto-series get an annular gap flushing with pressurization as an additional option. For that matter, low volumes of pressurized air or inert gas stream permanently through the annular gap of the sealing and flush it. Thereby the jamming of the lip of the sealing ring is avoided and the gap is cleaned. The over-pressure encapsulation protects additionally the shaft bearings against penetration of moisture from the wet, oily or glutinous media. Thus, a reliable level monitoring is always warranted even in such difficult products.