A device according to the present invention is of the post-mix type for dispensing beverages on a user's premises and mixing at least a first component (10) and a second component (20) to obtain a beverage. The device comprises a flow measuring means (100) configured to produce measurement information relating to the flow of the first component; a flow rate adjustment means (250) configured to vary the flow rate of the second component; a control means (300) configured to receive the measurement information (32) and to control the flow rate adjustment means (250) on the basis of the measurement information and a predetermined parameter; and a mixing means (400) disposed downstream of the flow rate adjustment means and configured to mix the first (12) and second (22) components.