The ring type metal detector or tube sensors are suitable for detecting the smallest all metal parts. They are used for monitoring raw materials for machine protection or in feed tubes for detecting screws or other metal parts. Ring sensors can also be used easily and efficiently for metal detection in other applications.

In the food industry, the ring detector uses between Multihead Weighers and vertical form fill and sealing machine. Complete devices with ejectors can be found in the Free-Fall Devices section.