An intervention device (1) for a conveyor line conveying products to be moved in an upright position, i.e. the largest dimension thereof being perpendicular to the normally horizontal conveying plane, such as bottles of liquid, the device including: a detection module (2) for detecting the position of the products in a detection area (3) on the conveyor line; a removal module (4) for gripping and removing products that are lying down from a removal area (5) on the conveying line; and a control module (6) receiving information from the detection module (2) and controlling the removal module (4) accordingly. A corresponding method is also described.