Buchi DuMaster D-480, Руководство по эксплуатации

Страница: 222 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
8 - Maintaining the instrument 222

The tube filling must not have any cavities. Therefore, tap the tube wall with a piece of wood or
cork when filling the tubes.

Filling the combustion tube requires the use of the provided plastic tube with dimension data.

To avoid some residues of the filling material sticking to the tube walls, filling should be carried
out through the plasic tube.

Correct positioning of the catalyst (CuO) and the ash crucible in the combustion tube is decisive
for optimum sample combustion.
Safety instruction
Strictly observe the safety instruction "Filling reaction tubes" under
Warning notes during operation
(on page 24).
Combustion tube filling
The following picture shows the fillings and filling heights of the combustion tube:
Legend:
1 Ash crucible
2 Corundum balls (10 mm)
3 80 g CuO + 20 g Corundum balls (87 mm)
4 Corundum balls (26 mm)
5 Wire mesh ronde
6 Spacer
Filling the combustion tube
Proceed as follows:

Place the tube in the tube rack.

Insert the spacer.

Insert the wire mesh ronde.

Fill the chemicals through the plastic tube into the combustion tube:

Fill in the corundum balls.

Pour the recommended amounts of copper oxide (CuO) and corundum balls into two small
beakers; then simultaneously pour from the two beakers into the combustion tube, so that a
good mixture is developed.

Fill in the corundum balls.

Insert the ash crucible.

Apply the cleaned Ni flap flange with O
2
lance.