User Manual

Working instructions
49
Grinding jar
nominal
volume
Sample
quantity
Max. feed
size
Ø7 mm
Ø10 mm
Ø12 mm
Ø15 mm
Ø20 mm
Ø25 mm
5.0 ml
0.5 - 2.0 ml
2 mm
1 or 2
-
-
-
-
-
10.0 ml
2.0 – 4.0 ml
4 mm
-
1 to 2
1 to 2
-
-
-
25.0 ml
4.0 – 10.0 ml
6 mm
-
5 or 6
2 to 4
1 or 2
-
-
35.0 ml
6.0 - 15.0 ml
6 mm
-
6 to 9
4 to 6
2 or 3
1
-
50.0 ml
8.0 - 20.0 ml
8 mm
-
12 to 14
6 to 8
3 or 4
1
1
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Arbeitsweise
6.4 Working instructions
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The grinding jar and its content are cooled by means of liquid nitrogen (LN2) until it
is possible to grind soft materials such as rubber.
Precooling is required until the ideal grinding temperature is reached. The drive
operates at a lower frequency (5Hz) here to prevent the moving parts of the device
from freezing. The fan is switched on during precooling and blows the air heated
by the motor in the front through the openings of the rocker arms into the grinding
chamber. This warm air prevents the rocker arm bearing from cooling down. It is
therefore also necessary to allow the fan to run on for a while after switching the
grinding off.
In the preliminary tests an average precooling of approx. 10 to 15 minutes was
determined. The grinding time was approx. 4 – 5 minutes.
The valve is switched off when the optimal temperature is reached. Grinding can
begin as from this time and the valve will be switched on and off according to the
temperature.
Grinding can also take place without cooling, in which case the cryo cycles are set
to -.
Manual cooling is started by pressing the shortcut (B10) and (START B13). The
valve remains open as long as the buttons are kept pressed.
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