BUCHI Rotavapo R II - Manual (Page 31)

5 Putting into operation
31 R II Operation Manual, Version E
5 .7 .3 Vacuum tubes
When connecting the red vacuum tubes,
proceed as follows:
• Use tube connections GL 14.
• The tubes used must all have the same inner
diameter (approximately 5 mm).
• Keep vacuum tubes as short as possible.
• When you are operating with the new
BUCHI Vacuum Controller V-850/V-855 and
Vacuum Pump V-700/V-710 connect a Woulff
bottle between the vacuum source and the
Rotavapor.
• When you are operating with another pump
than a V-700/V-710, connect a valve unit to
the V-850/V-855 to control the vacuum.
• Tubes do not need to be secured.
• Check the tubes from time to time and
replace them when they are brittle.
Fig. 5.7: Vacuum connections
5 .8 Functional test of vacuum tightness
Carry out the functional test after all described steps for putting the instrument into operation are
finished.
NOTE
The functional test can only be carried out with a vacuum controller installed or when you have
a pressure measuring device (manometer) connected to the tube between the pump and the
Rotavapor.
For this purpose, proceed as follows:
• Start the instrument and adjust the rotation speed as desired.
• Apply a vacuum. The instrument is now evacuated while the flask is rotating.
• Now interrupt the vacuum to the Rotavapor by carefully bending the tube. You should see on
the vacuum controller or on the measuring device whether the vacuum in the system remains
constant, i.e. the pressure increase per minute should be less than 3 mbar.
• If the vacuum does not remain constant, check all tube connections, retighten them and grease all
ball joints at the condenser side.
• If that still does not help, replace the seals as described in chapter 7.3.2.
• Afterwards, repeat the steps described above until the functional test is passed.