FRITSCH PULVERISETTE 7 premium line - Manual (Page 52)

5.12.2 Starting grinding at high speed
If the speed exceeds 600 rpm, the correct ball size must be selected.
CAUTION!
If the wrong balls are selected, they will be destroyed by
the high grinding energy.
Depending on the choice of the ball size, the maximum speed is reduced.
A reduced speed is indicated briefly by a flashing target speed indicator.
The Stop button stops the grinding process.
Press the Info button to display some system information and the type of
grinding elements.
Reference values for the speed limit
Ball diameter (mm) Speeds (rpm) for
agate
Speeds (rpm) for all
other materials
<5 1100 1100
5 900 100
10 750 850
>10 600 700
Using the device
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