Inspecting raw materials, whether in the food, plastics or carbon black industries, is gaining in importance. Zeppelin Systems’ rotary sifter is the ideal component for this task. It is used as a preliminary sieve in front of silos, as a final sieve underneath containers or as an inline sifter for pressure-tight operation up to 0.8 bar excess and vacuum pressure in pneumatic conveying systems. The sifter drum meets all high requirements regarding cleanability as it is easy to clean and to replace. A drum monitoring system issuing a warning signal prevents damage to the sifter and consequently product contamination.