Retsch Mixer Mill MM 500 nano, Manual

Page: 37 / 95

Operating the Device
37
6.6.2 Wet Grinding with Highly Flammable Materials
Wet grinding using highly flammable materials is permitted with this device if certain
precautionary measures are complied with.
When using highly flammable materials such as hexane, isopropyl, ethanol, benzine etc. as a
grinding aid , the inside of the grinding jars should be classed as Zone 0, i.e. as a permanent
explosive mixture.
It is therefore necessary to prevent potentially explosive vapours escaping from the clamped
grinding jars during a grinding process or being able to reach places which have the necessary
ignition energy. These vapours are in particular also pressed outwards by the temperature rise
that takes place and by the consequent increase in pressure inside the grinding jar.
For this reason we urgently recommend that the user of the device (the employer) assesses the
existing hazards within a coherent explosion protection concept according to local conditions
before using such solvents and, where necessary, records supplementary organisational
measures in an explosion protection document.
This approach is regulated in the EU under Articles 118 and 118a of EC Directive 89/391/EEC.
Account must be taken of corresponding provisions in other countries outside the EU.
6.7 Preparing the grinding jar
NOTICE
N14.0011
Wear or damage to the grinding balls and grinding jars
Use of different materials
−
Greater wear or damage is possible when operating the device with
grinding balls and grinding jars whose individual components are made of
different materials.
•
Only use grinding balls and grinding jars made of the same material.
NOTICE
N15.0000
Damage to the grinding jars
Incorrect filling of the grinding jars
−
The grinding balls damage the grinding jar and the device if the grinding
jars are not filled with any material or with insufficient material.
•
Do not operate the device without material in the grinding jars.
•
The filling in the grinding jars must not be less than 25 % of the
grinding jar volume.