Labconco FreeZone 6 Liter Benchtop Freeze Dry Systems 77520 Series - Manual (Page 27)

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Chapter 4: Using Your Freeze Dryer
Product Service: Domestic 1-800-522-7658, International 816-333-8811
2. Before adding another sample, allow system vacuum to return
to 0.133 mBar or lower. Any combination of valves and
sample sizes may be utilized at one time provided that the
system vacuum and collector temperature remain sufficiently
low to prevent melting of the frozen sample.
3. When all the frost has disappeared from the outer surface of the
sample container and no cold spots can be detected by handling
the container, the sample is nearly dry. To be certain of low
final moisture content, dry the sample for several hours past
this point.
4. To remove a container after drying is complete, turn the plastic
knob on the valve to the “VENT” position, which closes the
valve and vents the container. Should backfilling with an inert
gas be required, connect the gas supply line to the vent port on
the valve before turning the plastic knob on the valve to vent
position. The sample container may now be removed. In the
vent position the bevel on the valve knob should point away
from the sample port.
5. Ampules may be flame sealed while connected to a valve by
using a sealing torch. Care must be taken not to burn the valve.
An insulation material placed between the valve and the torch
is recommended.
Vent/Backfill Port
Bevel in “vent” position
Bevel in “vacuum”
position
Adapter