Abstract: A device for the treatment of fluid mixtures containing gases, such as in particular hydrogen, air, nitrogen or noble gases, and liquids, such as in particular ionic liquids, hydraulic oil or process liquids, having at least one separating stage (30) for separating the fluid mixture into a gas portion and a liquid portion, which, routed into a collection space (32), results in a float (44) rising, which, at a predeterminable liquid level in the collection space (32), actuates, without contact, a sensor device (42), which preferably actuates a discharge device for the purpose of draining the collection space (32), resulting in the lowering of the float (44), is characterized in that the outer circumference of the float (44) is guided axially displaceably along the inside of the housing wall (54) of the collection space (32), and in that the float (44) has at least one point of passage (50) for gas and/or liquid, which interconnects parts of the collection space (32) in a media-conveying manner, which parts are