BUCHI Rotavapo R-250 User Manual
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23
Rotavapor R-250
5 Operation
Adjusting the Optional Automatic Lowering of
the Bath
s
ባ, simultaneously
swit ch ing on the main breaker switch
ቢ.
4HIS
On = The lift lowering has been switched ON
Off = The lift lowering has not been switched ON.
s
REPEATEDLY
ባ.
s
MODE
ቭ is then pressed
repeatedly.
If the option is activated, the bath is automatically lowered
when the equipment is switched on. This ensures that, if there
is a short power failure, the bath will be lowered.
5.3 Selection of Distillation Temperature
In order to attain optimum distillation conditions, the energy
supplied to the distillation from the bath must be dissipated
again across the cooler. In order to ensure this, it is best to
work according to the following rule of thumb:
Cooling water
'T2 Boiling temperature 'T1 Bath
max. 20 ºC
40 ºC
60 ºC
How do you attain these conditions?
s
higher than 20 ºC.
s
rate of about 120–150 liters/hr.
s
the solvent is at 40 ºC.
s
Table of solvents.
Advantages of a Bath Temperature of 60 °C
s
of scalding.
s
not yet very high.
s
ficiently.
The solvent should condense out in approx. 2/3 to 3/4 of
the lengths of the cooling coils present.