Pressure regulator for a chromatograph

摘要

A method and apparatus is disclosed for providing a very reproducible chromatographic analyzer output by reducing variations in the chromatographic analyzer output due to changes in barometric pressure. An absolute back pressure regulator is utilized to provide a reference pressure for the chromatographic analyzer system. The reference pressure is not affected by changes in barometric pressure and thus the chromatographic output is not affected by changes in barometric pressure. Method and apparatus is also disclosed for reducing noise in a chromatographic analyzer system caused by pressure variations due to the switching of the chromatographic analyzer sample valve. A pneumatic accumulator is utilized to smooth small pressure surges resulting from actuation of the chromatographic analyzer sample valve and thus provides a smoother and more reproducible chromatographic analyzer output signal.