Patent ID: 6910377

Claim:
Dosing system for dosing a predetermined amount of liquid, comprising: a liquid reservoir with level measurement, comprising: a base body; a channel implemented in the base body and having an inlet and an outlet, the dimensions of a cross-section of the channel being selected such that a liquid when filled into the channel forms a liquid meniscus which demarcates a section of the channel filled with liquid from an unfilled section of the channel in which no liquid is present, wherein the dimensions of the cross-section of the channel, the liquid and a material of the channel are selected such that the position of the liquid meniscus in relation to the channel being substantially independent of the orientation of the liquid reservoir; and detection means for detecting the position of the liquid meniscus in relation to the channel so as to obtain a level measurement or a change in level measurement of the liquid reservoir by detecting the position of the liquid meniscus; means for exhausting the predetermined amount of liquid, the means for exhausting being connected to the outlet of the channel, or means for pumping gas into the unfilled section of the channel, the means for pumping being connected to the inlet of the channel; and control means for controlling the means for exhausting and the means for pumping, the control means coupled to the detection means of the liquid reservoir so as to obtain the level measurement or the change in level measurement and to control the means for exhausting and the means for pumping to dispense the predetermined amount of liquid from the channel via the outlet of the channel, depending on the level measurement or the change in level measurement; wherein the detection means are capacitive and comprise two electrodes electrically insulated from each other and mounted on the base body such that both the filled and the unfilled section of the channel extend between same, wherein an electric field to be generated between the two electrodes is present both in the filled section of the channel and in the unfilled section of the channel, and wherein a change in the position of the liquid meniscus leads to a proportional change in capacitance.