Conveyor with a metal detecting device

A harvesting machine, comprising harvesting means;

• and a conveyor including a metal detecting device for detecting metal parts in a conveying product, a magnet arrangement for producing a measuring magnetic field through which the conveying product is movable, a sensor device for registration a change of the measuring magnetic field, a signal evaluating device for evaluating a signal outputted by said sensor device in case of a magnetic field change, to recognize a metal part in the conveying product;
• and an interference sensor device which in case of a registration of an interference event, which leads to a magnetic field change caused not by metal parts in the conveying product and registered by said sensing device, outputs a faulty triggering warning signal.

A method of detecting metal parts in a conveyed product, comprising the steps of moving the conveying product through a measuring magnetic field, registering with a sensor arrangement a change of said measuring magnetic field;

• evaluating a signal outputted by the sensor arrangement in response to a magnetic field change for recognizing a metal part in the conveying product;
• detecting by an interference sensor device interference events which are caused not by metal parts in the conveying product and measured by the sensor device;
• and generating a faulty triggering warning signal in response to a registration of an interference event.