BUCHI DuMaster D-480 - Manual (Page 194)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 194
When to replace sealing elements
What sealing elements are used?
The following sealing elements are used:
 Half shells
 O-rings
 Quad rings
 Ferrules
When to replace sealing elements
The following table gives an overview of what instrument components contain which sealing elements
and when to replace these sealing elements:
Instrument component What to replace To be replaced when...
Ball valve Half shells ... the ball valve is serviced and the half shells
exhibit grooves.
O-rings ... the ball valve is serviced and
 the o-rings exhibit cracks or other damage
or
 the o-rings no longer protrude round out of
the grooves.
Quartz glass bridge O-rings ... you cannot feel any elastic resistance when
you press in the o-rings when installing the
quartz glass bridge.
Reduction tube plug O-rings
 ... you can hardly feel any contact pressure
when inserting the reduction tube plug.
 ... the o-rings no longer protrude round out
of the grooves of the plug.
Quad ring ... you cannot feel any elastic resistance when
pressing on the ball.
Drying tube (small, left) O-rings ... the o-rings no longer protrude round out of
the grooves of the plug.
Combustion tube connection
with Ni flap O-rings
 ... you can hardly feel any contact pressure
when inserting the combustion tube
connector into the combustion tube.
 ... the o-rings no longer protrude round out
of the grooves of the combustion tube
connector.
Post combustion tube O-ring
 ... you can hardly feel any contact pressure
when inserting the post combustion tube
plug.
 ... the o-rings no longer protrude round out
of the grooves of the plug.
Quad ring ... you cannot feel any elastic resistance when
pressing on the ball.
Drying tube (large, right) O-rings ... the o-rings no longer protrude round out of
the grooves of the plug.