Schematic representation of an <a href="https://en.wikipedia.org/wiki/en:High_performance_liquid_chromatography" class="extiw" title="w:en:High performance liquid chromatography">HPLC</a> unit. <br> (1) Solvent reservoirs, (2) Solvent degasser, (3) Gradient valve, (4) Mixing vessel for delivery of the mobile phase, (5) High-pressure pump, (6) Switching valve in "inject position", (6') Switching valve in "load position", (7) Sample injection loop, (8) Pre-column (<a href="https://en.wikipedia.org/wiki/en:HPLC" class="extiw" title="w:en:HPLC">guard column</a>), (9) Analytical column, (10) Detector (i.e. IR, UV), (11) Data acquisition, (12) Waste or fraction collector.
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Own work. Legend based on : Practical High-performance Liquid Chromatography by Veronika Meyer, 4th edition, John Wiley and Sons, 2004, <a href="//commons.wikimedia.org/wiki/Special:BookSources/0470093781" title="Special:BookSources/0470093781">ISBN 0470093781</a>, p. 7. and <a rel="nofollow" class="external text" href="http://www.chromatography-online.org">chromatography-online.org</a>. Used file : <a href="//commons.wikimedia.org/wiki/File:Computer_n_screen.svg" title="File:Computer n screen.svg">Computer n screen.svg</a> (Crystal SVG icons).