BUCHI DuMaster D-480 - Manual (Page 223)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 223
 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.
Notes regarding further operation
Please observe the following instruction:
 Working temperature: 950 °C.
Filling the post 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.
Safety instruction
Strictly observe the safety instruction "Filling reaction tubes" under Warning notes during operation
(on page 24).
Filling the post combustion tube
The following picture shows the fillings and filling heights of the post combustion tube:
Legend:
1 Silver wool
2 Corundum balls (76 mm)
3 200 g CuO + 15 g Pt catalyst (180 mm)
4 Corundum balls (50 mm)
5 Wire mesh ronde (22 mm)
6 Spacer
Working temperature 800 °C
Filling the post combustion tube
Proceed as follows:
 Place the tube in the tube rack.
 Insert the spacer.