Back to results
US 4,283,945 AGranted
Volume measuring apparatus
AssigneeHewlett-Packard Company
InventorDieter B. Knoll
Life of this patent
Estimating the term…
Abstract
A volumeter, in particular for use in liquid chromatography comprises a metering chamber for the volume to be measured. Another chamber is separated from the metering chamber by a resilient diaphragm and forms an electric capacitor. The capacitance of this capacitor is changed in accordance to deviations of the diaphragm from its true position.
Claims1
A volumeter, in particular for use in liquid chromatography, comprising:
- a first metering chamber for the volume to be measured;
- a second chamber being separated from the first chamber by a resilient diaphragm and forming an electric capacitor;
- said second chamber including:
- at least two capacitor electrodes insulated against each other;
- and
- a dielectric liquid in contact with the diaphragm and filling the gap between the electrodes to a higher or lower degree in response to deviations of the diaphragm;
- wherein any deviation of the diaphragm resulting from volume variations in the first chamber will change the capacitance of the capacitor.
4 more elements
Dependencies are inferred from the claim text.