FRITSCH PULVERISETTE 19 - Manual (Page 37)

10. Leave the sample pusher (24) down and move the plunger (23)
downwards.
ð The operating noise becomes louder.
11. Make pumping movements with the plunger (23). These pumping
movements draw in and press out air through the blower filter
above the collecting vessel. This air feeds the comminution mate-
rial through the sieve or lifts it off the sieve and feeds it to the
process again.
12. When the operating noise becomes quieter, the cutting procedure
is complete.
ð More comminution material can be added in.
6.4 Overload of the cutting mill
When filling and making downward movements with the plunger (23)
the working noise must be observed. The sound level is nearly identical
to the load on the machine. You can clearly hear from the pitch when the
mill reduces speed due to overload.
Pulling the plunger (23) out on time reduces the load on the mill and pro-
tects the rotor (3), the fixed knives (4, 5, 9) and the sieve cassette (7).
NOTICE!
If the cutting mill is overloaded, the motor protection
switch switches the device off.
The red Stop button lights up to indicate overload.
Then proceed as follows:
1. Switch the control switch (19) on the back of the device to 0.
2. Disconnect the cutting mill from the mains (remove the mains plug
(20) from the socket).
3. Allow the device to cool down.
4. Unscrew the 3 screws fastening the motor cover (14).
Using the device
- 37 -