Buchi DuMaster D-480, Operation Manual, Page: 196 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
8 - Maintaining the instrument 196
Visual o-ring/quad ring check
You can tell when o-rings or quad rings need to be replaced if they no longer protrude round out of
the grooves of the respective component. The following picture shows o-rings in a closing plug as an
example:
Removing sealing elements from grooves
Note
Please observe the following instruction:
Caution
Cutting sealing elements apart/out (o-rings, quad rings, half shells, ferrules).
When cutting sealing elements apart/out with a knife you may damage sealing
surfaces.
Never remove sealing elements with a knife but rather with tweezers.
Removing sealing elements
Proceed as follows:

Grasp the sealing element (o-ring, quad ring, half shell, ferrule) between your thumb and
forefinger.

Push the sealing element out to the side so that it forms a loop.

Grasp the loop with a pair of tweezers and pull the sealing element off.