BUCHI SpeedExtractor E-916 - Manual (Page 64)

7 Maintenance
64 SpeedExtractor E-916/E-914 Operation Manual, Version D
7.2 Periodic maintenance
7.2.1 Sealing system
The condition of the cup seals is crucial for the tight-
ness of the system. Any kind of contamination on
either the sealing surface of the extraction cell or the
seal itself significantly reduces the lifetime of the seals.
Therefore, always proceed as described in section
6.3.3 to fill the cell. Rinse the seals thoroughly with
organic solvent (e.g. ethanol) with a wash bottle and
a beaker to collect the solvent. With clean operation
the cup seals should last for approximately 100 runs.
In addition, make sure that cup seal holders are not
blocked by sand or dust. The holders need to be flex-
ible to seal the extraction cells properly.
NOTE
When replacing the seals, take care not to damage them. To avoid damaging the seals, never apply
grease and never touch them with sharp objects.
7.2.2 Replacing the cup seals
b
d
c
a
Replacing the upper cup seals
To replace the seals, push the heating block until it
is locked in the back position. Optionally, remove the
deflector a. This is not mandatory to get access to
the cup seals. Unscrew the top cover plate b us-
ing the Torx screwdriver c (P/N 053668). The cup
seal d can now be taken off manually and be replaced
(P/N 053669 for E-916, 053671 for E-914). Be aware
of the upper brown PEEK ring. They easily get lost
when the cup seal is taken off. Proceed in reverse or-
der to install the new seal. Make sure that the spring of
the seals always points to the extraction cell. Perform
a leak test to check the tightness of the system (see
section 6.2.5).