Grinding While Cooling; Replacingthe Grinding Tool; Maintenance And Cleaning - IKA M20 Betriebsanleitung

Grinding while cooling

Plastic, soft or smeary materials have to be cooled if they are to be
ground.
There are two hose couplings located at the rear of the grinder in
order to connect the cooling brine. Cooling with tap water is usual-
ly sufficient for substances which become hot as a result of the
grinding operation and are thus given to smearing or those that pro-
duce oil.
The grinding chamber may only be filled halfway especially when
drugs containing oils and similar materials are ground.
If more refrigeration is required then the ground matter should be
cooled prior to being put into the grinding chamber.
The followiung procedure shall apply if liquid nitrogen is used in
order to embrittle the material to be ground:
• The sample to be ground is put into a suitable vessel (e.g. evapo-
rating dish) and covered with enough liquidnitrogen until it is com-
pletely covered.
When using liquid nitrogen make certain that the sample is not
capable of reacting with oxygen.
• Cool grinding chamber using liquid nitrogen.
• Put the deep-cooled sample into the grinder and grind approxima-
tely 15 seconds.
• Then open the grinder and add liquid nitrogen for only as long as
it takes for the sample to become deep-cooled again (embrittled).
• Repeat the grinding operation for approximately 15 seconds.
A10/M20 1097
Safety information:
Suitable protective gloves must be worn when filling and
transferring liquid nitrogen!
Protective glasses must be worn!
Safety information:
Make certain that the liquid nitrogen has evaporated befo-
re beginning the grinding operation.
NOTE: Danger of overpressure!
• Repeat the sequence of cooling and grinding until desired finen-
ess has been achieved.
• If the required fineness has not been achieved after 5 minutes,
then a further reduction in grain size is unlikely.
The respective grinding chambers are sealed by means of labyrinth
sealings. Though they are dust-proof, they are not leak-proof. This
should be taken into account for substances where liquids may
escape.
Replacing the grinding tools
The grinding tool is fixed by means of the retaining tube and the cap
nut is unscrewed by using zhe SW8 or 10 spanner. The grinding
tool, which rests on a double-edge track, may then be pulled out.

Maintenance and cleaning

The IKA A10 and M20 are maintenace-free. It is subject only to the na-
tural wear and tear of components and their statistical failure rate.
When ordering spare parts, please give the manufacturing
number shown on the type plate, the machine type and the
name of the spare part.
Please send in equipment for repair only after it has been cleaned
and is free from any materials which may constitute a health hazard.
Use only cleansing agents which have been approved by IKA to clean
IKA devices. To remove use:
Dyes isopropyl alcohol
Construction materials water containing tenside / isopropyl alcohol
Cosmetics water containing tenside / isopropyl alcohol
Foodstuffs water containing tenside
Fuels water containing tenside
For materials which are not listed, please request information from IKA.
Wear the proper protective gloves during cleaning of the devices.
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