2 general inspection and cleaning instructions, Warning – BUCHI Wet Digester B-440 User Manual
Page 28
7 Maintenance and repairs
28
B-440 Operation Manual, Version D
7.2
General inspection and cleaning instructions
Check the housing for visible defects (switches, plugs, enclosure etc.) and clean it regularly under safe
conditions with a damp cloth. Wipe off any splashes of aggressive chemicals immediately using a
damp cloth in order to avoid any damage being caused to the plastic coating on the housing.
Cleaning under safe conditions
Switch off the Wet Digester and unplug the power cord.
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๓ Let the system cool down completely!
Perform cleaning actions
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After each use:
Check the glass components for damage (e.g. stars, cracks or blind spots). Exchange defective
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parts immediately.
Clean the glass hood and vitrified ceramic plate with water.
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Separate glassware joints from each other.
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Do not grease ground-glass joints under any circumstance.
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!
WARNING
Death or serious burns by electric current at cleaning.
Switch off the instrument
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Disconnect the power cord and prevent unintentional restart
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Wait until the instrument is completely dry before reconneting to mains
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All parts must be completely dried before the system can be connected to mains again!
7.2.1
Additional cleaning instructions
Condensate trap
The activated charcoal does not have to be cleaned or changed until the glass wool at the inlet has
clearly changed colour or has become sticky. However, it is generally sufficient just to change the dirty
glass wool.
Extraction hose
The extraction hose(s) can be rinsed through with water or ethanol. Cleaning using an ultrasonic bath
is also suitable.
Crucibles
Do not rapidly cool down hot crucibles or any other hot glass or ceramic parts e.g. with cold water.
The resulting temperature shock might lead to tension and cracks in the material.
Glass components and sealing surfaces
Clean the glass components after each working process to prolong their lifetime. The glass assem-
blies can be taken out and cleaned manually with water and a commercial cleaning agent (e.g. mild