Handbook of Advanced Chromatography / Mass Spectrometry Techniques
Chapter 7 - Introduction to Two-Dimensional Liquid Chromatography - Theory and Practice
by Dwight R. Stoll

Figure 7-23. Locations of pressure sensors and resulting pressure traces recorded during the switch from Position 1 to Position 2 of these valves. The traces in (C) are for the valve shown in Panel A, and the traces in (D) are for the valve shown in Panel B. The colors of the traces correspond to the locations of the sensors indicated with the same colors. 1D, first dimension; 2D, second dimension.

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