FRITSCH PULVERISETTE 7 premium line - Manual (Page 31)

5.1.3 Grinding bowl lid
The grinding bowl lids seal the grinding bowl gastight after manual pre-
tensioning (see also Ä Chapter 5.8.2 ‘Safety measures against an exces‐
sively high pressure’ on page 40). The locking hooks are designed to
withstand an internal grinding bowl pressure of up to 40 bar.
Because the overpressure relief does not work in the case of sudden
pressure surges, we would like to warn you explicitly that in the event of
an explosion in the grinding bowl, the hooks could be torn off.
DANGER!
Danger to life!
An explosion in the grinding bowl may cause severe injuries
and damage to the device.
In the context of our product monitoring, we would like to inform you
about the following damage cases that have occurred:
n During dry grinding of a light alloy/resin mixture, there was a severe
explosion of the grinding bowl after 64 cycles (5 min. grinding + 10
min. pause; 800 rpm) that completely destroyed the device.
n During wet grinding of silicone powder in DEGBE (solvent), there was
an explosion in the grinding bowl exploded after 11 cycles (10 min.
grinding + 30 min. pause) that ripped off the locking hooks of the
grinding bowl lid. The grinding bowl lid caused irreparable damage
to the mill hood and the safety blocking mechanism stopped the
mill.
n During dry grinding of a silicon compound, in grinding conditions not
known to us and not disclosed by the customer, there was an explo-
sion of the grinding bowl that ripped the locking hooks off the
grinding bowl lid.
5.2 Choice of grinding bowls and grinding balls
CAUTION!
If the grinding elements used are not genuine accessories,
we assume no guarantee and exclude all liability for
damage to the device or for personal injury.
Using the device
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