Schmeiser, Olsen & Watts LLP
Coordinating injector-valve switching with pump-stroke timing to mitigate effects of pressure pulses
A liquid chromatography system includes an autosampler with an injector valve by which a sample at low pressure within a sample loop is introduced into a high-pressure solvent mixture stream. A solvent delivery system includes a pump in fluidic communication with the injector valve of the autosampler to deliver the solvent mixture stream thereto. The solvent delivery system further comprises a processor that calculates a number of strokes of the pump needed to deliver the solvent mixture stream to the injector valve of the autosampler. The processor counts strokes of the pump during delivery of the solvent mixture stream. In response to a stroke count equaling the calculated number of strokes, the processor signals the autosampler to switch the injector valve to introduce the sample to the solvent mixture stream during a pump transfer period within which the pump performs pressure control to compensate for a drop in pressure.
WATERS TECHNOLOGIES CORPORATION
G G G G G G G B B G G
G01N G01N G01N G01N G01N G01N G01N B01D B01D G01N G01N
additional additional inventional additional inventional inventional additional additional additional additional additional
Miguel John Guo-Zhong John
Soares Lamoureux Li Heden