Abstract: A sensor for continuously releasing a liquid, such as a lubricant, over an adjustable period of time, includes a reservoir from which the liquid is ejected by a movable working plunger. The working plunger is moved with a driving force transmitted from a power transmitter, which is connected to a brake plunger and which counteracts the driving force with a brake force by reducing the volume of a chamber filled with a paste-like liquid and ejecting the liquid. The paste-like liquid is then pressed through a tube, which can then be cut therethrough.