Hewlett-packard Company

Agilent Technologies, Inc.

Michael Q Thompson

Kenneth J Klein

Robert C Henderson

Paul C Dryden

Wei J Song

Matthew Spangler Klee

Richard P White

James D McCurry

Lesley M Freed

Richard J Phillips

R John Phillips

A method and apparatus for detecting a flow disruption within a gas chromatograph (GC) inlet. A controller controls an input flow of a gas entering a chamber of the GC inlet, and the output flow of gas leaving the chamber. A flow disruption is detected when at least one of the input and output flows deviates from a target value.

Pneumatic testing for gas chromatograph inlet

A system for controlling fluid flow comprises a first fluid conduit having a length, an inner diameter, an input pressure and an output pressure, and a second fluid conduit having a length, an inner diameter, an input pressure and an output pressure where the output pressure of the first fluid conduit is the input pressure of the second fluid conduit. The system also comprises a pressure sensor configured to determine the output pressure of the first fluid conduit, and a controller configured to control the output pressure of the first fluid conduit, thereby establishing a desired fluid flow through the second fluid conduit based on the length of the second fluid conduit, the inner diameter of the second fluid conduit, the temperature of the second fluid conduit and the type of fluid flowing in the second fluid conduit.

System and method for controlling fluid flow

The present invention refers to a novel apparatus and method to restrict pneumatic flow in a planar manifold. A forming tool of specific geometry is pressed into a planar manifold causing the pneumatic channel inside to collapse onto itself in a predictable and controllable way, therefore restricting the fluid flow in the pneumatic channel. The geometry of the forming tool is provided with angles and radii so that the planar manifold is not ripped during the pressing operation. Further, the geometry limits the deformed area so that distortion of adjacent pneumatic channels, and the potential for springing leaks between layers is minimized. In a preferred embodiment, the tooling also provides flow measurement while the forming tool is pressed into the planar manifold at a specific orientation.

Apparatus and method for restricting fluid flow in a planar manifold

Apparatus and method are provided for controlling at least one physicochemical property of carrier fluids and/or support fluids provided to chromatographic detectors by determining a physicochemical property of the one or both fluids and controlling that property using interactive feedback loops.

Apparatus and methods for controlling fluids provided to a

Apparatus and methods are disclosed for performing a chromatographic separation of a given compound utilizing programmed temperature and mass flow wherein the compound is injected into a pressurized carrier gas and passed through a column and wherein a portion of the column is subjected to a temperature profile, by determining the pressure of the carrier gas and generating a pressure information signal representative of such pressure, storing desired carrier gas mass flow information and temperature profile information, and controlling the pressure of the carrier gas in response to the mass flow information, the temperature profile information and the pressure information signal, so that as the temperature profile information changes with time, the desired mass flow of carrier gas at a corresponding time is maintained by controlling the pressure of the carrier gas.

Gas chromatograph having integrated pressure programmer

Apparatus and methods are disclosed for performing a chromatographic separation of a given compound wherein the compound and a carrier gas are passed through an injection port and onto a column and wherein a portion of the column is contained in an oven. The apparatus and method are shown to include a first heater for heating the injection port in response to a first control signal, a first temperature sensor for sensing the temperature of the injection port and for generating a first temperature signal representative of the temperature of the injection port, a second heater for heating the oven in response to a second control signal, a second temperature sensor for sensing the temperature of the oven and for generating a second temperature signal representative of the temperature of the oven and a cooling member for simultaneously cooling the injection port and the column. The cooling member can include various conduit arrangements for directing a flow of cryogen fluid. There is also shown a valve for controlling the flow of cryogen fluid through the cooling member in response to a third control signal, and a control member for receiving the first and second temperature signals, and for generating the first, second and third control signals in relation to the first and second temperature signals, so that the temperature in the injection port and the oven are maintained at a desired level.

Growing community of inventors

Coatesville, PA, United States of America

Michael Q Thompson