A delivery device includes first and second housing portions that selectively engage and disengage. The tray includes opposing first and second sidewalls, opposing front and rear walls and a bottom floor. A controlevaluation unit, which determines volume- andor mass-flow of the medium in the pipeline on the basis of the travel time difference of ultrasonic measuring signals in the stream direction and opposite to the stream direction is also provided. In another aspect, a value is assigned to a time-based parameter and combined with a changepoint value to calculate changepoints. According to the invention, it is provided that the profile has a recess for receiving a connecting region, in particular a seam, of cover segments of an at least two-piece cover.