Compact, low-profile chromatograph

Details Compact, low-profile chromatograph Compact, low-profile chromatograph

1996-10-22

1998-09-08

Brock, Michael

Measuring and testing

Gas analysis

Gas chromatography

96105, 96106, G01N 3002

Patent

active

058047018

ABSTRACT:
An analytical instrument includes a control system, including a computer and a pneumatic controller responsive to the computer, and a planar chromatographic assembly. The planar chromatographic assembly includes a planar pneumatic manifold, a heater/fan assembly for establishing a temperature-controlled zone, an insulating enclosure for confining the temperature-controlled zone to an oven cavity and certain zones of the planar pneumatic manifold, a separation column having inlet and outlet ends attached to couplers at selected internal fluid-bearing conduits in the pneumatic manifold and located closely adjacent the planar manifold and within the temperature-controlled zone, and one or more fluid-handling functional devices attached to the pneumatic manifold for fluid-tight communication with respective internal etched channels provided within in the planar pneumatic manifold. The fluid-handling functional devices may be surface-mounted or edge-mounted to certain ones of the etched channels in the planar pneumatic manifold. The fluid-handling functional devices may include: a) passive devices such as an injector section, a fluid coupler, or a vent for coupling a fluid stream to or from a selected fluid-bearing conduit; b) active devices such as a valve, a fluid regulator, a fluid flow input device (fluid source), operable in response to a control signal from the control system for controlling fluid flow in one or more selected etched channels in the planar manifold, or c) signal generating devices such as a sensor or detector operable so as to provide sense or detection signal indicative of a characteristic of the fluid flow in an etched channel or in the separation column. The combination of the planar manifold and the edge- or surface-mounted fluid-handling functional devices allows the planar chromatographic assembly to be constructed in a compact, low-profile form factor.

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James. B. Angell, Stephen C. Terry and Phillip W. Barth, "Silicon Micromechanical Devices", Scientific American, Mar. 1983, pp. 44-55.

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