6 Operation
45 R-210/215 Operation Manual, Version B
6.3 Lowering and raising the evaporating fl ask into and out of the heating bath
1
2
3
The stop-position of the quick-action jack can
be adjusted so that neither the vapor tube, the
manifold, or the Combi Clip touch the bottom
or edge of the bath and a desired immersion
depth of the evaprotion fl ask in the heating bath
is achieved.
To adjust the stop-position of the quick-action
jack, proceed as follows:
Push the button up or down to move the
quick-action jack to the desired position.
Pull the knob and release it again. The
stop-position is now fully extended and will
remain in this position until adjusted again.
To re-adjust the stop-position later, push the
button up to raise the quick-action jack a
little, than proceed as described above.
•
•
Fig. 6.4: Lowering and raising the evaporating fl ask
6.4 Selecting the distillation conditions
To achieve optimal distillation conditions, the distillation energy supplied by the heating bath must be
removed by the condenser.
To ensure this, operate the instrument according to the following rule of thumb:
Cooling water: max. 20 °C Vapor: 40 °C Bath: 60 °C
How are these conditions achieved?:
Set the bath temperature to 60 °C.
Set the cooling water temperature not higher than 20 °C.
Allow cooling water to fl ow through the condenser at approximately 40 – 50 l/h.
Defi ne the operating vacuum in such a way, that the boiling point of the solvent is 40 °C. The corre-
sponding pressure can be seen from the Solvent Table in chapter 3.
Advantages associated with bath temperatures of 60 °C:
The evaporating fl ask can be replaced without risk of burns.
The evaporation rate of the water from the heating bath is low (low energy loss).
The heating bath energy is used at a good degree of effi ciency.
This rule can also be applied to lower bath temperatures, e.g.:
Cooling water: 0 °C Vapor: 20 °C Bath: 40 °C
•
•
•
•
•
•
•
To Next Page
Loading...
