Mettler-toledo Safeline Limited

Paul Rigby

An apparatus () for detecting metal is equipped with at least one test device () with a non-metallic guide tube (). Only a proximal end of the guide tube is connected to a pneumatic control unit (). A distal end of the guide tube has at least one first ventilation port (). A test article (), having a known mass of metal, is movable back and forth between the proximal end and the distal end of the guide tube, at least through a section of an electromagnetic field, to verify operation of the metal detection The pneumatic control unit can use air pressure, either elevated above or reduced below the ambient pressure, applied to the proximal end of the guide tube in order to drive the test article back and forth, or only in one direction if it is returned by gravitational force.

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Bolton, United Kingdom

Paul Rigby