Sorting apparatus

Sorting machine with an inspection zone (4) for the detection of impurities or unwanted products (6) in a flow of granular products (1) moving through this inspection zone (4) with at least one light source (7) for generating a light beam (8), wherein means are provided to move this light beam (8) substantially transversely to the direction of movement of the product flow so that substantially all products (1) are hit by the light beam (8) in said inspection zone (4) in order to generate a reflected stream of light (12), wherein the light from this light beam (8) is directly reflected by the products (1) from an impact point of the light beam (8) on the products (1) and is reflected as scattered from a zone around this impact point, wherein at least one detector unit (13) is provided to detect light reflected by the products (1) in order to generate detection signals, wherein this detector unit (13) cooperates with a control unit in order to sort the products (1) by means of these detection signals, characterised in that said detector unit (13) contains at least two sensors (19,20) that are provided one after the other in said reflected stream of light (12) so that a sensor (19) is placed upstream of a downstream sensor (20), wherein each sensor (19,20) detects a different part of the reflected stream of light (12).