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Chapter 4: Using Your Freeze Dryer
3. Before adding another sample, allow system
vacuum to return to 133 x 10-3 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.
4. 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.
5. 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, simply connect the gas
supply line to the vent port on the valve. The
sample container may now be removed. In the
vent position the bevel on the knob should
point away from the sample port.
ote location of taper on
knob in vacuum position.
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