Please note that the grinding jars may heat up to over 100°C depending on the grinding jar size,
the ball filling, the speed and the grinding time.
The PM100 is fitted with a fan which extracts the waste heat created during grinding directly
from the grinding chamber. The extraction volume per hour is greater than 20 times the
grinding chamber volume. The fan has standstill monitoring with signalling.
The airflow from the fan during grinding can be discharged into an extractor hood if necessary.
Check that the locking mechanism is secure before removing the grinding jar.
Only remove grinding jars with locking mechanism, and only open after cooling when in a safe
position (extraction device).
5.22 Wet Grinding with Highly Flammable Materials
Wet grindings using highly flammable materials are permissible with this device when complying
with specific precautionary measures.
When using highly flammable materials as grinding aid, such as hexane, isopropanol, ethanol,
petrol or similar, it is to be assumed that the inside of the grinding jars should be classified as
zone 0, i.e. a constantly present explosive mix.
Therefore, it is necessary to prevent potentially explosive vapours during the grinding process
from escaping from the clamped grinding jars and from entering areas in which the requisite
ignition energy is present. These vapours may be pressed out of the grinding jar in particular by
the heating which takes place and the resulting pressure increase inside the grinding jar.
It is therefore urgently recommended that the managing operator (employer) using the device
assesses the dangers that exist before using corresponding solvents, taking local conditions
into account, as part of a coherent explosion protection concept. If necessary, supplementary
organisational measures should be recorded in writing in an explosion protection document.
This procedure is regulated in the EU under Articles 118 and 118a of Directive 89/391/EEC. In
other countries outside the EU, the comparable provisions are to be observed.
The following must be verified with respect to the device:
− Only grinding jars with safety closure devices may be used!
− It is necessary to consider the durability of the O-rings (EPDM 75° shore) when selecting
the solvent and the durability of the adhesive used when using ceramic inserts.
− The safety closure devices of the grinding jars must be tightened firmly.
− Please note that the grinding jars can heat up considerably depending on the grinding jar
size, the ball filling, the speed and the grinding duration.
− Before removing the grinding jars, the tightness of the safety closure devices must be
check anew.
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