Download Operation Manual

BÜCHI Rotavapor R-220
4 Putting into Operation
4.14 Reset of the over-temperature protection
If the heater heats up over 205°C (e.g. if no heating medium
is in the bath), it is cut off by a mechanical overtemperature
protection.The overtemperature protection is reset by pushing
the button under the heating block.
Fig. 22: Reset of the over-temperature protection
4.15 Heating Medium
Never operate the heating bath when there is no heating medium in it!
Suitable heating media include:
• Water (some Borax should be added when using
deionized water)
• Heat transfer oils suitable for use at temperatures up to
160° C (e.g., Ucon HTF 14, Fluka AG).
• Water-soluble polyethylene glycol
(e.g., Polyethylene glycol 600, Fluka AG).
After the oil bath has been standing opened for a prolonged
period, condensation water can collect on the bottom. When
the bath is used again, it must be heated above 100°C with
rotating flask in order to drive the water out.
4.16 Checking Installation
After installation has been completed and before doing the
first distillation, check to make sure the installation has been
carried out correctly:
• Inspect the glass visually for possible damage.
• Check that all connections (steam, water, vacuum) have
been fixed properly in position.
• Check the tightness of the vacuum.
19