User Manual

Safety and occupational health instructions
52
The grinding tools may become worn, depending on the frequency of the grinding
operation and the sample material. The grinding jars and the balls should be
regularly checked for wear and replaced if necessary.
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8.5 Checks
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Correct functioning of the hood switch must be checked regularly.
• Switch on the machine with switch (K).
• Start grinding operation with start button (B13 - Start).
• Lift the hood.
If there is an opening gap of a few cm the machine switches itself off and F04
appears in the display.
• Cancel F04 with stop button (B13 - Stop).
If this switching-off function does not take place the CryoMill must be checked
immediately by Retsch-Service.
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9 Safety and occupational health instructions
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CAUTION
Danger of injury to eyes and skin
Frostbites through liquid nitrogen
– Liquid nitrogen has a temperature of –196 °C and may cause
injuries similar to burns on skin or eye contact or cause frostbite.
• Always use goggles and wear protective gloves when
opening the cooling casing and the grinding jar.
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CAUTION
Use of liquid nitrogen
– Retsch GmbH rules out any liability claims that may arise in the
use of liquid nitrogen or similar cooling agents.
• Please observe the safety regulations of the cooling liquid
supplier.
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9.1 General
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This section summarises the general occupational health and safety guidelines for
the handling of liquid nitrogen.
CAUTION
Handling liquid nitrogen
General hazardous situations
– The following hazardous situations may arise in the handling of liquid