Buchi B-585, Руководство по эксплуатации

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17
Glass Oven B-585
5.3.3 Filling with the Material to be Dried
The drying accessory consists of three parts. While the drying
is in progress, the drying tube
a
into which the product is
put (either directly or inside a container), is in the oven. The
end cap
b
that catches the moisture evaporated off can be
filled with desiccants to improve the drying effect. A stop-
cock
c
is used to evacuate or aerate the sample chamber.
The aluminum flange ring
d
joins the two glass sections
in a screwed joint, sealing them vacuum-tight. The flange
ring
e
is also used to hold the drying accessory in position
within the glass oven. This drying accessory does not rotate.
The material to be dried can be placed in the drying tube in va-
rious ways. The method chosen depends mainly on the amount
of substance.
Example A
A large quantity of the material to be dried is placed directly in
the drying tube. With this method, existing glass boats, metal
dishes, etc., may be used. This drying method should not be
used for hygroscopic samples, as these may absorb moisture
during transfer to another container after having been dried.
Example B
The material to be dried is placed in its container and the con-
tainer is placed in the drying tube. The drying oven must be
operated in the vertical position for this method. The advantage
of this method is that the substance does not need to be trans-
ferred from one container to another after drying, and that its
container can be sealed im me dia tely after drying.
Example C
A hard surface layer is created while drying some sub stan ces
which increases the drying time dramatically. This can be avoi-
ded by rotating the container regularly. It is therefore recommen-
ded to use the notched rotation drying flask
which can only
be used in conjunction with an electrical ball tube
drive.
5 Operation
b
c
e d
a
Fig. 12: Direct Drying A
Fig. 13b: Indirect Drying B Fig. 13a: Indirect Drying A
Fig. 14: Rotation Drying Flask C