System Options:
CryoCleanerEC
C O N F I D E N T I A L – FEI Limited Rights Data
7-41
CryoCleaner Operation
Once mounted the Nitrogen vessel can be placed in the Vacuum vessel. Secure the two components by fixing the
clips to the top of the Nitrogen vessel and locking the clips down. Take care that the 'O' ring seal on the Vacuum
vessel is secure when joining the two components together.
Dewar Vessel Refilling
W A R N I N G !
The handling of LN2 should be performed wearing face and hand protection in the form of a face visior and a pair of
thermal protective gloves.
Users must not touch the cold surfaces of the Dewar as this can result in burns. Use the Safety Pliers provided, when
handling the Nitrogen Vessel.
1.
Pump the specimen chamber, the Vacuum vessel is pumped along with it.
2.
When the specimen chamber vacuum is ready (Pumped status), partially fill the Dewar with the use of funnel
(the plastic cap upside down) and wait until boiling stops.
3.
Then fill the Dewar and place the plastic cap at the top of the CryoCleaner. The volume of liquid Nitrogen
needed is approximately 500 ml.
Note
The LN2 stops boiling very quickly so that no vibration is seen from this device. If the CryoCleaner needs to be used for
longer periods it can be refilled with LN2.
Before re-filling it is recommended to perform vessel baking.
FIGURE 7-14
Plastic Cap Filling Position / Plastic Cap Operation Position
Removing Nitrogen Vessel
W A R N I N G !
Use the Safety pliers provided when handling the Nitrogen vessel.
Removing the Nitrogen vessel depends on the level of contamination found in the specimen chamber. If the level is
unusually high then the CryoCleaner can work continuously till improvement is seen, otherwise normally after
approximately 2 to 3 hours the Nitrogen vessel can be removed.
Note
It is not recommended to leave it inside the vacuum vessel after all nitrogen evaporates, because contamination evaporates
back to the chamber.
If the chamber is vented with the Nitrogen vessel filled with LN2 (or still significantly below the ambient temperature), it
should be removed and baked before it is re-used.
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