• Take note of the safety data sheets for the samples and follow instructions by taking
appropriate measures in advance.
• Do not grind any explosive and/or flammable substances.
• Do not grind any substances that might become explosive and/or flammable during
grinding.
• The components that come into contact with sample material can get very hot or cold during
operation. Before removing the samples, wait for the temperature to adjust, and wear
protective gloves if necessary.
• Always wear protective gloves and goggles when handling liquid nitrogen for cryogenic
grinding.
• Under no circumstances fill liquid nitrogen or dry ice into the grinding jar and then close the
jar. The high pressure that arises in the jar would burst the grinding jar open.
Servicing and repair
• Before servicing, switch the device off at the main switch.
• Only clean the device with a dry or damp cloth.
• Do not clean the device with compressed air.
• Have all repairs carried out by the device manufacturer or by an authorised agent.
2.7 Preventing damage to equipment
• Protect the device against condensation if large fluctuations in temperature are to be
expected (e.g. during air transport.
• Do not knock, shake or throw the device during transport and installation.
• Comply with conditions at the installation site when installing the device.
• Under no circumstances fill liquid nitrogen or dry ice into the grinding jar and then close the
jar. The high pressure that arises in the jar would burst the grinding jar open.
• Only clean the device with a dry or damp cloth.
• Do not use any solvent or aggressive detergent for cleaning.
• Only use original spare parts for maintenance work.
2.8 Safety instructions on the handling of liquid nitrogen (Oxygen deficiency)
The main components of air according to volumes are as follows:
– Oxygen O2 21 %
– Nitrogen N2 78 %
– Argon Ar 1 %
The gases contained in the atmosphere are not toxic. However, a change in concentration (in
particular changes to the oxygen concentration) may have effects on life and burns. It is
therefore essential for the air breathed in to contain sufficient oxygen (> 19 %).
Humans cannot detect changes in the composition of air within the time that will actually be
necessary because the components are colourless and odourless.
2.8.1 Dangers
A danger of suffocation exists as a result of the normal evaporation of the liquid nitrogen that
pushes out the oxygen in the air. An oxygen deficiency is dangerous and can cause death
through suffocation. The reaction of the organism to oxygen deficiency will differ greatly
To Next Page
Loading...