5 | Installation
BÜCHI Labortechnik AG
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Operation Manual Rotavapor® R-300
5.5
Fitting PTFE stopcock (optional accessory)
3
4
1
2
Fig. 8: Cooling condenser with PTFE stopcock and backfeed tube
1
Tube on PTFE stopcock
3
Three-way tap
2
Handle on three-way tap
4
Solvent backfeed (tubing)
NOTE
The PTFE stopcock does not have to be greased.
u
Insert the tube (1) into the end of the PTFE stopcock and through the vapor duct
into the evaporating flask.
u
Carefully insert the PTFE stopcock into the cooling condenser. When doing so,
hold the PTFE stopcock so that the three-way tap (3) is still facing forwards.
NOTICE! Take care not to damage the sealing lips on the PTFE stopcock.
u
Rotate the PTFE stopcock 90° so that the three-way tap points upwards.
u
Connect the backfeed tube (4) to the PTFE stopcock.
u
Turn the handle on the three-way tap (2) to the desired position.
The PTFE stopcock performs various functions depending on its position:
Three-way tap handle pointing forwards: additional solvent can be fed into the
evaporating flask via a connected backfeed tube.
Three-way tap handle pointing left: the system is sealed.
Three-way tap handle pointing backwards: system is being vented.
5.6
Fitting the Interface I-300/I-300 Pro (optional accessory)
The I-300/I-300 Pro is designed for indicating, adjusting and controlling the complete
distillation system. The Interface I-300 settings enable precise specification of the
individual process parameters.
The interface unit can be mounted on the vertical adjustment handle.
Tools required:
Torx keys Tx20 and Tx30