BUCHI Rotavapo R-215 - Manual (Page 30)

4 Description of function
30 R-210/215 Operation Manual, Version F
4 .7 Valve unit
If using the Rotavapor without the Vacuum Pumps V-700/710,
or with a vacuum controller other then the V-850/855, the valve
unit shuts off the connection of the vacuum source when the set
point of the vacuum controller is reached. Also, the valve unit
serves as a separator to collect small amounts of liquid that may
have condensed in the vacuum tubing thereby protecting the
pump against contamination.
Fig. 4.10: Valve unit
4 .8 Woulff bottle
The Woulff bottle serves as safety vessel between the Rotavapor
and the vacuum pump. In case of an impure distillation the con-
densate is collected in the Woulff bottle and thus cannot reach
the pump.
Fig. 4.11: Woulff bottle
4 .9 Combination of Rotavapor and vacuum controller
The vacuum controller controls the selected pressure within the Rotavapor and constantly corrects
any deviations. The Rotavapor and the vacuum controller can be connected, so that the starting and
stopping of the rotation and the raising and lowering of the evaporating flask is carried out by the
vacuum controller, i.e. when suitably configured:
• the distillation is started via the vacuum controller, the evaporating flask is lowered until it reaches
the desired stop position (adjustable) and the rotation is started.
• the distillation is stopped via the vacuum controller, the rotation is stopped and the evaporating
flask is raised from the bath.