FRITSCH PULVERISETTE 6 classic line - Manual (Page 38)

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.
6.8 Settings on the control panel
6.8.1 Setting the speed
n Switch on the main switch (10) on the back side of the device (I).
n The green POWER SUPPLY ready status indicator lights up on the
control panel.
ROTATIONAL SPEED control panel area
Press and hold the + or - button.
The speed can be selected in steps of 10 between 100 and 650 1/min.
The actual speed is displayed during operation. The nominal speed is
briefly displayed when the + or - button is pressed.
6.8.2 Setting the running time
TIMER control panel area
n Press the MILLING button, it lights up; press the + or - button and
select the running time in hours (0..99) and minutes (0..59).
n Set the pause time if cooling down is necessary. Press the "Pause"
button, it lights up; press the + or - button and select the pause time
in hours (0..99) and minutes (0..59).
If no pause time is required, set the pause time to 0.
Using the device
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