A method is provided for controlling a data transmission device. The indicator system includes at least one dye component and a polymer mixture. A path is defined between the inlet and the outlet of the separating assembly. The labeling head of the present invention can be used either with a cutter, a spreader or as a standalone unit. The modified input image data is transmitted to the marking engine for rendering the remainder of the print job. The system comprises a container having an interior adapted to hold fuel, the container comprising a first opening placing the interior in fluid communication with the ambient atmosphere, and a volumetrically-adjustable sizing device adapted to change volume in response to changes in surrounding air pressure, the sizing element disposed within the container and adapted to contain a fluid.