Vistus is available with an optional, reduced metal-free zone. This option is available for both rectangular as well as round coils. Among other things, the reduced, metal free zone is achieved by a modified winding in the coil design. This modification creates a counter field to the primary field of the metal detector thus limiting the electromagnectic field of the metal detector. This provides many advantages, above all, to limited installation spaces as is normally the case with discharge chute systems.