... 2008 Introduction:Series GJT-B High sensitivity metal detector for belt conveyor is the latest product in metal detecting field. In ... ability, series GJT-B metal detector is widely used for belt conveyors in thermal power, cement, paper, mining, forestry, ... ~2.5220±10%50HzAll metallic materials bigger than 15mm, including iron, aluminum, copper, stainless steel, manganese steel, chrome steel, etc ...