KD Scientific Centrifan PE - Manual (Page 21)

Installation
Centrifan TM PE Personal Evaporator 2-5
make the connections from the cold trap. The ½” T-fitting is used to attach a 20mL
scintillation vial at the bottom of the cold trap return tubing. This vial helps prevent
any condensate which forms in the cold trap exit tube from re-entering the enclosure
and slowing the evaporation process.
g) If your application will not require drying in an oxygen-free environment, leave the
jumper-piece of 1/8” ID tubing between the two small barbed fittings as shown in
Figure 2-3.
Note: If you require evaporation with an oxygen-free environment, see the
instructions for adding the tubing designed to purge the enclosure with inert gas
in Section 2.7.