The sorter supplies the identified items to the appropriate chutes. Typical sorters are line sorters (shoe sorters), tilt-tray sorters or cross-belt sorters. Depending on the process requirements and technologies used, the identification systems are positioned at infeed zones or directly at the main sorters. A great variety of different sensors control and monitor stable and reliable sorting processes. The corresponding applications include, among other things, empty detection, double detection, position detection, damage detection, leading edge and distance detection, speed detection, cell detection, position detection, cell identification, maintenance inspection, and safety.