BUCHI DuMaster D-480 - Manual (Page 208)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 208
Phase 2: Removing the Ni flap (continued)
Proceed as follows:
 Press the reduction tube plug (5), the combustion tube connection (3) and the post combustion
tube connector (1) down lightly and pull the furnace out of the instrument to the front.
 Caution: Tilting and jamming the combustion tube connection can damage the combustion tube.
Pull the combustion tube connection (3) out of the combustion tube with careful jiggling motions.
 Place the combustion tube connection with Ni flap (3) on the tube rack.
 Allow the flange to cool down to room temperature.
Phase 3: Cleaning the Ni flap
Proceed as follows:
 Slowly pull out the O
2
lance.
 Remove sooty particles from the metal surface by means of a wire brush. For cleaning the Ni flap
itself use a soft brush (e.g. toothbrush).
 In case of heavy contamination, both sides must be cleaned. For this purpose remove the o-rings
and the O
2
lance.
 Place the complete combustion tube connection with the Ni flap in ethyl alcohol or in a laboratory
cleaner (duration approx. 15 min).
 Brush again the metal surface and the flap itself as described above.
 Remove possible residues of ethyl alcohol with water and allow the combustion tube connection
to dry.
 Insert the o-rings again.
 Slightly grease the o-rings.
 Insert the O
2
lance again.