FRITSCH PULVERISETTE 7 classic line - Manual (Page 36)

CAUTION!
The maximum permissible temperature of the grinding
bowl outer casing is 100 - 110 °C (agate, max. 70 - 80 °C).
The grinding duration is therefore based on the maximum
bowl temperature. The grinding duration at which the tem-
perature is not exceeded depends on the material, ball, and
speed. For this reason, the user should determine it
through experimentation.
The temperature of the outer casing of the grinding bowl
during wet grinding must be at least 30 °C below the boiling
point of the liquid used.
NOTICE!
– Monitor the warming of the grinding stock.
– A longer running time may require pause times for
cooling down.
– Check that the clamping device is firmly connected
when switching on again after a cooling-down phase.
NOTICE!
If grinding bowls are removed during a grinding pause,
check that they fit correctly before the device is switched
back on.
The extent to which the heating up of grinding stock needs
to be observed depends of course on the sample used in
each individual case. Note ® a longer running time may
also require a longer pause time for cooling down.
To reduce the grinding time, you can use a grinding bowl and grinding
balls with a higher density, and thus a higher impact energy.
The mill can also run for several hours during low-speed operations for
mixing and homogenisation.
Operation with an external time switch is not possible.
Using the device
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