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VDL (E3.1) 10/2020 Page 53/196
6. Installation and connections
The chambers may only be installed, connected, and commissioned by specialist personnel. Specialist
personnel must have knowledge of the types of ignition protection and regulations and ordinances for
equipment used in hazardous areas (Ex areas).
Verify whether the Ex classification (Ex classification label on the type plate) is suitable for the application.
6.1 Vacuum expansion racks and rack holders
Vacuum expansion racks and rack holders can easily be removed from the chamber. This offers the
advantage of an inner chamber with smooth walls, which is easy to clean.
Inserting or loosening an expansion rack and inserting or removing the rack holders may only be
done in the absence of solvents and under extraction (technical ventilation).
The rack holders can only be removed from the chamber after removing the expansion racks.
Rack holder installation: Align the rack holders to the cams in the bottom of the inner chamber and insert
them.
Prior to insertion check the expansion racks and rack holders for corrosion . If corrosion is detected, the
affected element must not be used.
DANGER
Explosion hazard due to creation of mechanical sparks in an explosive atmosphere.
Serious injury or death from burns and / or explosion pressure.
Insert or remove the expansion racks and rack holders only in the absence of solvent.
Insert or remove the expansion racks and rack holders only with active extraction
(technical ventilation).
Prior to inserting the expansion racks and rack holders, check them for corrosion.
∅ Do NOT use corroded expansion racks and rack holders.
The vacuum expansion racks made of aluminum (also option-
ally available in stainless steel) allow low-loss heat transfer to
the material. The strong tension causes the racks to fit tightly
against the interior wall and their large-surface contact area
ensures rapid and effective heat transfer.
The removable rack holders allow for easy positioning.
You can remove the expansion racks for easy cleaning. Do
not remove them too often in order to prevent wear.
Figure 10: Operating the expansion racks
• Pushing the locking lever: The expansion rack is released and can be removed.
• Pulling the locking lever: The expansion rack is pressed against the inner chamber walls.
Remove or insert the vacuum expansion racks only when the chamber is empty and has
cooled down. NO explosive atmosphere must be present. Active extraction (technical ventila-
tion) is mandatory.
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