Top-down X-ray scanners inspect the product from above and for this the camera taking the image is located underneath the conveyor belt. This construction is always chosen when the height of the products is low compared to their surface area.
Top-down X-ray scanners are used even when the raw material is present in the form of bulk goods (rice, raisins, cereals). Multiple flap systems in the WIPOTEC-OCS X-ray scanners reduce the amount of material ejected with the foreign bodies into a collection box to the technical minimum by interrupting and diverting the product flow on only one track for a short time. This design saves over 80% of the good product which would otherwise be separated out with the foreign bodies.