Abstract: The invention relates to a heating device for a rack of a diagnose robot comprising: -a polygonal, oval or cylindrical ring (221) defining a polygonal, oval or cylindrical closed wall, having a bottom opening (222) and a top opening (223) -wherein the bottom opening matches the size and form of a filter membrane and/or supporting body (2, 3) of a carrier (1) of a filtration assembly; and -one or more heating elements (224) selected from -a heating element which is integrated into the ring, -a heating element which is arranged on the outer and/or inner surface of the wall defining the ring, and -a heating element arranged in or on a lid, wherein the lid matches the size and form of the opening of the ring.