Waters Technologies Corporation

Michael Eggertson

Joseph D Michienzi

Keith Fadgen

Stanislaw Koziol

Zongren Shang

Joshua A Shreve

Michael O Fogwill

Abhijit Tarafder

Jeffrey Musacchio

Thomas S McDonald

A variable fluidic restrictor of a liquid chromatography system including a stator body, the stator body include a plurality of fluidic channels located within the stator body, wherein each fluidic channel of the plurality of fluidic channels includes a restrictor element, wherein a flow of a fluid through the variable fluidic restrictor is selectively restricted based on a position of an external element coupled to the stator body is provided. Furthermore, an associated method is also provided.

Variable fluidic restrictor having selective restriction

A liquid chromatography solvent pump includes at least one motor, a first piston, a second piston, and a continuously variable output drive system coupling the at least one motor to at least one of the first and second pistons. The first piston and the second piston are configured to deliver a flow of solvent in a liquid chromatography system.

Continuously variable output liquid chromatography pump drive

The present disclosure relates to methodologies, systems and apparatus for controlling pressure in a CO-based chromatography system. A first pressure control element is located downstream of a CO-based chromatography system and is disposed to control pressure within the column. A split restrictor is located downstream of the primary pressure control element and is disposed to divert a portion of the mobile phase flow to a detector. A second pressure control element is located downstream of the split restrictor and is disposed to control pressure at the restrictor. While the first pressure control element executes a pressure-controlled gradient separation, the second pressure control element maintains a constant pressure at the restrictor. During a composition-programmed gradient separation, the second control element maintains a constant pressure at the split restrictor while the first pressure control element maintains a constant average density across the column.

Carbon dioxide based chromatography systems including multiple pressure control devices

Growing community of inventors

Natick, MA, United States of America

Michael Eggertson