This is just awesome. Maybe other people are doing this, but I've never seen it.
Can you see what that is? It is a way of diverting the sweep gas so it is useful for nanospray applications! At the beginning and end of a run, alternative tune files are used at BRIMS. These tune files contain instructions to turn on the sweep gas. This appears to effectively blow away the stuff that comes off the column at the beginning and end of the runs and extends the amount of time they have between cleanings!
Want to set your own up?
It's the P-430 Union at Upchurch Scientific. This setup has been shown to work on both LTQ Orbitrap systems and the Q Exactive.
Correction (thanks guys!) its a P432, not P430. For more details see this new post.