Buchi Wet Digester B-440 Manual de usuario descargar pdf (Pagina 14)

4 Description of function

14 B-440 Operation Manual, Version D

4 Description of function

This section explains the basic working principle of the Wet Digester B-440. It also shows how the

instrument is structured and provides a general functional description of its assemblies.

4.1 Functional principle

The set-up with the optional condensate trap is suitable for all wet ashing operations (e.g. when using

sulphuric acid). The ratio between the weight of the sample / acids and the temperature program must

be selected in such a way that practically only gaseous products are produced by the reaction.

Digestion process overview





Glass hood

Vitriﬁ ed

ceramic plate

Acid vapor outlet

to Scrubber









Condensate trap

Activated

charcoal

Corrugated

hose

Processing steps:

The infrared heating s generates high temperatures (up to 600 °C) to heat up the crucibles.

Inside the crucibles s  the digestion process of the sample material takes place.

Hot fumes s rise into the glass hood and are safely withdrawn by the suction ﬂ ow of the

Scrubber.

The digestion fumes can be highly corrosive and hazardous to life forms! The optional condensate s

trap can be interconnected between the glass hood and the scrubber to neutralize most of the

hazardous fumes in the ﬁ rst place.

The activated charcoal must be kept in place within a sandwich layer of glass wool s  at each end

of the condensate trap.

Every glass-to-glass connection must be secured by a clip s !

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 41 42

Sin comentarios

Buchi Wet Digester B-440 Manual de usuario Pagina 14