Retsch CryoMill Autofill 50l - Manual (Page 21)

Operating the machine
21
• Close the waste gas / overflow valve (V3).
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4.7 Pressure build-up
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• Close the withdrawal valve (V1) and the waste gas / overflow valve (V3).
• Open the pressure build-up valve (V2).
• Watch the pressure indicator (DM).
• Close the pressure build-up valve (V2) as soon as the needle reaches the
red marking or nitrogen comes out of the pressure relief valve (PSV).
Fig. 6: Pressure gauge
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4.8 Withdrawal of liquid nitrogen
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• Attach the liquid nitrogen line to the CryoMill and to the connection (SA).
• Open the filling and withdrawal valve (V1).
• After taking the liquid, close the filling and withdrawal valve (V1) again.
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4.9 Pressure relief
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• Close the pressure build-up valve (V2).
• Open the waste gas valve (V3).
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4.10 Transport
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CAUTION
Risks of liquid or gaseous nitrogen
Positive pressure in the vessel
–
The introduction of energy during transport can cause a sudden surge in
pressure. Nitrogen is blown off then and this can cause a lack of oxygen,
cryogenic burns, oxygen enrichment and associated risks.
• Make sure the vessel is depressurised before you transport it,
• Remove the siphon and put in the transport plugs.
• Transport the vessel only in an upright position.
• Avoid impacts and vibrations.
• Secure the vessel against falling down, rolling away and damage.
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It is impermissible to use the following agents and tools:
• pliers
• striking tools
DM