BUCHI Glass Oven B-585 Kugelrohr - Manual (Page 20)

18
Glass Oven B-585 5 Operation
5.3.4 Placing the Drying Tube in the Drying Oven
If the material to be dried has been placed in the drying tube
according to Chapter 5..., the tube and the end cap are scre-
wed together. The entire assembly is then placed in the drying
oven and fastened with the screw a . You should ensure that
the stopcock is vertical and that the reservoir in the end cap is
directed downwards.
The oven temperature must be set for drying and, if necessary,
the vacuum must be connected. After drying, aeration follows,
either using the air in the environment or using an inert protective
gas using the corresponding gas connection. The assembly is
taken out of the oven and left to air-cool.
5.3.5 Working with Desiccants
The drying of substance samples containing water can be ac-
celerated and optimized by using desiccants such as silica
gels, CaCl
2 or P 2 O 5 . Such desiccants are placed in the rear part
of the end cap. When filling with a free-flowing desiccant, you
must make sure that the end cap remains clean between the
aeration stopcock and the flange. If dust particles adhere to the
sides, then the end cap must be cleaned afterwards. Otherwise,
there is the danger that of these particles will be taken with the
flow of air when aerating the evacuated drying tube, thereby
adding impurities to the material to be dried.
The safety guidelines on the original packaging of the P 2 O 5 /
CaCl 2 should be observed.
Fig. 16: Desiccant
Fig. 15: Drying Tube
a