FRITSCH PULVERISETTE 2 - Manual (Page 29)

6.7 Filling the grinding stock / Starting the grinding process
1. Open the latch of the lid. Open the laboratory mortar mill.
2. Fill a maximum of 190 ml grinding stock (particle feed size < 8 mm)
into the front area of the mortar.
3. Close the lid of the mill. Secure the lid by closing the latch.
4. Set the desired contact pressure. Standard setting for most sam-
ples: 10-15 daN and lateral contact pressure; the first ring is
visible.
5. Set the desired grinding duration.
6. Start the laboratory mortar mill by pressing START.
7. If necessary, adjust the mill settings while the mill is running (see
Ä Chapter 6.4 ‘Setting the grinding pressure’ on page 24).
8. Scraper fine adjustment:
While grinding, hold the guide rod and release the lever. Move the
scraper up and down and to the left to adjust its position to the
wall until it rests optimally against it.
6.8 Removing the grinding stock
1. Stop the grinding process by pressing STOP or wait until the set
grinding time has elapsed.
2. Open the latch of the lid. Open the lid of the laboratory mortar
mill.
3. Release the mortar from the bayonet catch and lift it. Then, posi-
tion it in the centre under the pestle and (for instance in the case
of dry grinding) brush off the remaining fine dust.
4. Take the mortar out of the mill to empty it. See Ä Chapter 6.3
‘Installing / removing the grinding set’ on page 22.
6.9 Grinding with external cooling
For certain grinding stock, adding coolant before grinding can benefit
comminution. It is possible, for instance, to make the sample brittle by
freezing it with liquid nitrogen (N
2
) or in a freezer before grinding it. The
grinding stock should, however, be protected against water condensa-
tion - e.g. a plastic bag can be used to keep the grinding stock dry during
cooling until it is ground.
Using the device
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