BUCHI Rotavapo R-250 - Manual (Page 30)

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Rotavapor R-250 6 Maintenance
6.4 Changing the Seals on the Distribution
Head
s
on all 3 bolts, but do not screw the nuts completely off.
s
s
carefully lift the distribution head off the glass assembly.
s ቢ laid in at the front and replace it.
6.5 Installing and Removing the Vacuum Seal
During the running-in phase, which lasts approx. 10 hours,
the seal may show signs of increased wear. This is normal
for a PTFE seal.
s
the distribution head.
s
s
and pull the seal out.
s
inside and the metal guide ring facing outward.
s
in-side.
s
s
s
the seal.
s
up and in, and hand-tighten all 3 knurled nuts.
The unit should be tested for leaks each time the vacuum
seal has been removed.
Fig. 6.6: Taking out the Vacuum Seal
Fig. 6.5: Replacing the seal in the distribution head
ቢ