VWR VP 8 Vac Manuel D'instructions page 8

English
 fine adjustment valve;
 safety vent valve;
 on/off switch of the system;
 on/off switch of the pump.
A base plate with support rods supports all system parts. The fine adjustment valve, safety vent valve,
system on/off switch and pump on/off switch are clearly positioned together within one operating unit.
1 Vacuum pump
2 Base plate
3 Separator
4 High performance condenser
5 Operating unit
6 Fine adjustment valve
7 Digital vacuum meter
8 Safety vent valve
9 Inert gas connection
10 On/Off switch of the system at
control unit
11 On/Off switch of the pump at
control unit
12 On/Off switch of the pump at pump
A Condenser gas outlet
B Gas inlet
The Separator (suction side)
The separator enables collection of particular matter and droplets. This protects the pump from
contamination and ensures maximum performance of the pump. The separator is made of a specially
treated glass and features implosion protection.
The High Performance Condenser
The high performance condenser enables condensable components in the vapor to be separated out and
hereby removed from the atmosphere and at the same time protecting the environment.
The condensate is collected in a glass flask. The flask is attached to the condenser flange with a ball-and-
socket joint. The condensation temperature is maintained by running cold water or recirculated coolant
through the condenser.
The Fine Adjustment Valve
The fine adjustment valve allows the vacuum to be regulated precisely by turning the valve knob.
The Digital Vacuum Meter
The line-powered digital vacuum meter displays the current pressure in absolute mbars or in torr (depending
on current setting).
The Safety Vent Valve
A short press on the head of the safety vent valve produces a light increase of pressure in the system, a
longer press aerates to atmospheric pressure. An inert gas connection is attached to the safety vent valve.
5.2.2 Function
The vacuum system facilitates a completely smooth evaporation in the rotary evaporator (patented system).
This method helps to minimize solvent loss and the distillation can be carried out in a controlled fashion.
At the beginning of evaporation the fine adjustment valve will be opened until the boiling point is reached.
Then the fine adjustment valve can be closed and the pump switched off. In order to counteract possible
leakage from the rotary evaporator, the fine adjustment valve can be opened slightly, if the pump is switched
on. By so doing the pump operates close to its ultimate vacuum, so that only very small flow rates exist. This
removes both the danger of the boiling pressure in the flask of the rotary evaporator going too low as a
result of high current speed as well as the threat of solvents being carried away.
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Fig. 4: Description vacuum system VP 8 Vac