Mixing of dry nitrogen with nitrogen bubbling through washing bottle filled with solvent of interest (e.g. water). In the example with water, this should allow to control relative humidity of our samples, i.e. sample cell. Water can be replaced onto other organic solvents. We are especially interested in precise control of slow flows, since the flow should flush a sample cell of a noise sensitive instrument. Therefore the GB2000 sounds like better choice.

The contamination of nitrogen one can actually smell simply as a kind of “plastic” smell. Nitrogen passing through e.g. PE pipes starts to smell after “plastic”. Therefore, it is essential for us to use rather inert materials. We are interested to keep our samples under certain humidity for over day or longer, therefore we are looking to replace operator who controls the valves manually onto an automatic mixing station, i.e. MCQ solution.