Metal detectors with a frame

Frame

— an emitter in the form of a contour of a thin metal pipe, having a rectangular or close to it shape. Such devices are larger than coils, they are used exclusively in "long-range" metal detectors using RF or PI technology (see "Operating principle"). The frame is able to provide a good detection range, including in complex mineralized soils, but it “sees” only rather large objects, and it is poorly compatible with the discriminator (see “Functions / Capabilities”).