FRITSCH PULVERISETTE 2 - Manual (Page 21)

6.1.3 Setting the grinding duration
The desired grinding duration can be set with the " + " and " - " buttons.
Depending on the set operating mode, the display indicates hours/
minutes or minutes/seconds.
6.1.4 Grinding mode/Grinding stop
The START button starts the grinding process (only if the lid is closed).
The display indicates the remaining time of the grinding process. When
the grinding time has elapsed, the preset time is displayed again.
If the grinding process is interrupted by pressing STOP or opening the
hood, the display indicates the remaining grinding duration. When the
device is started again, the grinding process is continued according to
the remaining duration.
When the grinding duration has elapsed, the mortar stops.
Remember that the grinding stock heats up during grinding. The grinding
parameters must be selected depending on the permissible treatment of
the grinding stock.
6.2 Selecting the mortar and pestle
When choosing the material for the grinding parts, consider the hard-
ness of the material to be ground and the tolerance of impurities - how-
ever small they may be - due to friction with grinding parts.
Mortar and pestle of the following materials can be used:
Material
(Mortar and pestle)
Order no. (grinding set) Abrasion resistance
Mineral materials
Hard porcelain 46.211.0.00 Sufficient
Sintered corundum 99.7 Al
2
O
3
46.2060.00 Fairly good
Agate 99.9 SiO
2
46.2050.00 Good
Zirconium oxide 94% ZrO
2
46.2120.00 Very good
Metal materials
Stainless steel 17-19% Cr + 8-10% Ni 46.2100.00 Fairly good
Tempered steel 11-12% Cr + 1.92 - 2% C 46.2090.00 Good
Stainless steel, monolithic 17-19% Cr + 8-10% Ni 46.2140.00 Fairly good
Tungsten carbide 93% WC + 6% Co 46.2080.00 Very good
Using the device
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