FRITSCH PULVERISETTE 2 - Manual (Page 25)

6.4.3 Pre-crushing settings for coarse samples
To pre-crush coarse samples of up to 8 mm, the adjusting nut (c) can be
raised above the zero position if necessary so that coarse particles fit
below the pestle and can be comminuted. (see the illustration under
Ä Chapter 6.4.1 ‘Positioning the pestle against the bottom of the mortar’
on page 24) For subsequent fine grinding, the pestle is lowered again to
the desired position. (Set to contact pressure [daN Downforce] between
2.5 - 17.5 daN)
6.5 Adjusting the vertical pressure scale
On new devices that are delivered with a mortar and pestle, the scale is
adjusted to fit the grinding parts and does not need to be readjusted
during commissioning.
The scale has to be readjusted if different or new grinding parts are used.
6.5.1 Adjusting
1. Install the empty mortar (without grinding stock) and fasten it to
the carrier plate (see Ä Chapter 6.3.1 ‘Installing/removing the
mortar’ on page 22)
2. Insert the pestle into the latch bearing in the lid (see
Ä Chapter 6.3.2 ‘Installing/removing the pestle’ on page 23).
3. Close the lid (1) with the latch (5)!
4. Unscrew the adjusting nut (c) until the pestle is lifted from the
bottom of the mortar.
5. Unscrew the adjusting screw (f) for the lateral pressure setting
until it stops.
6. The pestle is moved to the grinding chamber centre.
Using the device
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