US Patent 7334457 Multi-capillary viscometer system and method

This apparatus and method relates to the improved sensing of fluid differential pressures. The apparatus and method can be applied in multi-capillary solution viscometers and gel permeation chromatography systems used in the characterization of polymers. A valve is used to alter a flow path in a measurement circuit to reduce or eliminate an undesired fluid output and to accelerate the regeneration of the fluid for analysis of subsequent samples. The apparatus and method can be usefully applied to all instruments and systems comprising viscometers having two or more capillaries.