Chapter 5: Using Your Freeze Dryer
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39
Original instructions
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.
Starting a Program
(for optional drying accessories)
If one of the electronically controlled accessory drying chambers, suitable for your
Freeze Dryer, has been properly installed, you will be able to run a program.
BEFORE STARTING A PROGRAM YOU SHOULD ALWAYS ENSURE
THAT THE COLLECTOR IS “ON” AND HAS COOLED TO -40°C OR
BELOW.
Vent/Backfill Port
Bevel in “vent” position
Bevel in “vacuum”
position
Adapter
