Retsch Cryomill - Manual (Page 23)

Transport, scope of delivery, installation
23
CAUTION
Risk of injury and danger of frostbite
Bursting of the inlet hose.
–
Depending on the operating state of the device, liquid nitrogen may be
enclosed in the supply line. When heated this may lead to the inlet hose
bursting.
• The maximum pressure in the external liquid nitrogen supply line
may be a maximum of 1.5 bar. The use of a safety valve is absolutely
essential!
The connection for the liquid nitrogen (LN2) is a G 1/4 inch threaded connector .
The operating pressure in the liquid nitrogen supply line should be at least 0.5 bar.
The lower the pressure of the liquid nitrogen supply line, the longer the precooling
takes. At 0.5 bar supply line pressure and with the system at room temperature,
precooling requires approx. 10 minutes. Depending on the application, you can
execute up to 4 grinding operations with 10 litres of liquid nitrogen.
Throughout the entire duration of cooling, the air humidity in the chamber
condenses on all cooled parts as a layer of ice .
After cooling this condensation drips into the collecting filter and evaporates.
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CAUTION
Risk of injury and danger of frostbite
Uncontrolled escape of liquid nitrogen
–
There is a risk of injury in the event of an uncontrolled escape of liquid
nitrogen.
• Stop the liquid nitrogen supply line immediately!
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NOTICE
Depending on the ambient temperature, air humidity and duration of use, small
quantities of water may drip from the collecting filter.
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4.10 Removing the liquid nitrogen feed line
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Abb. 13: Removing the liquid nitrogen feed line
CAUTION
Before you remove the liquid nitrogen feed line, the pressure must be relieved for
safety reasons.