IKA A10 basic Mode D'emploi page 18

Note: only water (max. 40 °C) could be used for coolant
and water pressure should less than 1 bar for the instru-
ment. After the grinding, please ensure the cooling water
is completely empty from the cooling chamber.
Cooling with tap water is usually sufficient for substances
which become hot as a result of the grinding operation
and thus are given to smearing or those that produce oil.
The grinding chamber may only be filled halfway espe-
cially when samples containing oils and similar materials
are ground.
Note: Moisture in material that is ground may evaporate
because of the material temperature increasing. Then, the
evaporated moisture will condense and flow out from the
drain hole at the bottom of the instrument.
This could prevent the motor from damage of moisture.
If more refrigeration is required, the ground matter should
be cooled prior to being put into the grinding chamber.
Grinding dust may also leak out from this drain hole dur-
ing grinding process.
Working with coolants – Dry ice cooling (CO
Please follow the safety instructions.
Crushing causes the mill feed to heat up. This may not al-
ways be desirable as the mill feed can change when heat-
ed (e.g. increased oxidation, loss of moisture, evaporation
of volatile components, etc.).
It may only be possible to crush mill feed which is viscous
or has a high fat content by embrittling using coolants.
The A10 basic offers following cooling processes:
First put the feed product into the grinding pot and then
add crushed dry ice.
Thoroughly mix the dry ice with the mill feed.
Only attach the chamber cap when the dry ice is com-
pletely vaporized, otherwise high pressure may build up in
the grinding chamber.
Please note that the mill feed heats up again extremely
quickly during grinding (it may reach room temperature
again after approximate 10 seconds of grinding). You may
have to repeat the process several times if the product is
not adequately ground after one cooling process.
drain hole
Fig. 5
):
2
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