Patent ID: 7503340

Claim:
A system for controlling fluid flow in a gas chromatograph, comprising: a first fluid conduit having a length, an inner diameter, an input pressure and an output pressure; a junction coupled to the first fluid conduit; a second fluid conduit coupled to the junction, the second fluid conduit having a length, an inner diameter, an input pressure and an output pressure, where a junction pressure comprises the output pressure of the first fluid conduit and the input pressure of the second fluid conduit; a pressure sensor coupled to the junction and configured to determine the junction pressure; and a controller coupled to the junction and the pressure sensor and configured to dynamically control the junction pressure by providing additional flow to the junction or by relieving excess flow from the junction in response to the junction pressure determined by the pressure sensor, thereby establishing and maintaining a desired fluid flow through the second fluid conduit independent of a flow through the first fluid conduit.