BUCHI Rotavapo R-215 - Manual (Page 34)

5 Putting into operation
34 R-210/215 Operation Manual, Version F
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a Water inlet
b Water outlet
c Water level indication
d Level adjustment for the replenishment
e Overflow
Connect the feeding water hose to the hose
connection for the water inlet a.
Position c indicates the water level within the
heating bath and can be adjusted by
pulling up or down the level adjustment tube d.
Thus, the overflow in the cylinder e is moved
up or down and therewith changes the water
level within the heating bath by means of the
corresponding tube. Connect the drain hose
to the hose connection for the water outlet b.
The excess water coming from the overflow is
drained off here.
Fig. 5.4: Water flux within the heating bath replenishment of the Heating Bath B-495
5 .3 .2 Heating medium
If you use a water bath, which is not suitable for the operation above 100 °C only water may be used
as heating medium (the use of any type of oils is not allowed). In case of an oil bath (e.g. B-491) only
specially approved heating bath liquids may be used. We advice against using silicone oils and low
molecular weight PEGs (Mol weight < 400 g/mol). We recommend Ucon HTF 14, Sigma-Aldrich AG
as heating oil.
When the heating bath is used with heating oil
You should change the heating oil occasionally depending on the status of the oil (color, odor). If the oil
vaporizes (expecially low molecular weight PEG) make sure that it does not condense on the surface
of the Rotavapor as it can peel away the coating.
When the heating bath is used with water, please consider the following notes: Depending on the
water hardness a mixture of deionized water with distilled water to a ratio of 1:1 volume shares is
allowed. The use of the water bath with pure distilled or deionized water is not allowed due to the
corrosiveness towards stainless steel. In case the use of pure deionized or distilled water as heating
medium cannot be avoided, the addition of 1–2 g borax (Na
2
B
4
O
7
x 10 H
2
O) per liter water is manda-
tory.