BUCHI DuMaster D-480 - Manual (Page 222)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 222
Filling the combustion tube
Note
Note the following rules:
 Observe the filling heights indicated as exactly as possible.
 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 (3 mm)
3 80 g CuO + 20 g Corundum balls (110 mm)
4 Corundum balls (10 mm)
5 Wire mesh ronde (22 mm)
6 Spacer
Working temperature 950 °C
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.