FEI Quanta FEG 250, User'S Operation Manual

Page: 198 / 228

System Options: CryoCleanerEC
9-50
CryoCleanerEC
These equipments allow to decrease the contamination level in the
system. The CryoCleanerEC can be efficient to approximately 24
hours (CryoCleaner – older version – has silver plated Dewar vessel
and can be efficient about 10 hours).
The kit consists of:
• Vacuum vessel, including o-rings, screws
• Vacuum vessel lid
• Nitrogen vessel (Dewar) with cap, including proper warning labels
• Nitrogen vessel stand
• Nitrogen vessel safety Pliers
• Manual
WA R N I N G !
This option uses liquid Nitrogen (LN2), which may cause serious
cold burns.
PARTS AND ACCESSORIES
The CryoCleanerEC consists of a Nitrogen vessel that is surrounded
by an outer container - the Vacuum vessel, which is connected to one
of the specimen chamber ports by a vacuum seal. The space between
is then pumped by the microscope vacuum system.
FIGURE 9-43 NITROGEN VESSEL
VACUUM VESSEL WITH ACCESSORIES
When the specimen chamber (together with the CryoCleaner) is
pumped, liquid Nitrogen is introduced to the Nitrogen vessel. Its
outside cold surface absorbs contaminating products from the
specimen chamber. The vacuum in the specimen chamber improves
over a short period and contamination is now reduced.