Manual

6 Operation

45 R-210/215 Operation Manual, Version F

6.3 Lowering and raising the evaporating ﬂask into and out of the heating bath

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 evaporation ﬂask in the heating bath is

achieved.

To adjust the stop-position of the quick-action

jack, proceed as follows:

• Push the button a up or down to move the

quick-action jack to the desired position.

• Pull the knob b and release it again. The

stop-position c is now fully extended and will

remain in this position until adjusted again.

To re-adjust the stop-position later, push the

button a up to raise the quick-action jack a

little, than proceed as described above.

Fig. 6.4: Lowering and raising the evaporating ﬂask

NOTE

When a 4 l evaporating ﬂask is used the stop-position extension (Order no.: 44466) must be used

additionally.

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 ﬂow through the condenser at approximately 40–50 l/h.

• Deﬁne 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 ﬂask 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 efﬁciency.

This rule can also be applied to lower bath temperatures, e.g.:

Cooling water: 0 °C Vapor: 20 °C Bath: 40 °C