Buchi DuMaster D-480 User Manual download pdf (Page 223)

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101

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

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.

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Buchi DuMaster D-480 User Manual Page 223

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