Chapter 5: Using Your Freeze Dryer
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Original instructions
2.
To stop a program (at any time) go to the Programs screen, select
(highlight) the program that is currently running, press Stop. This will
turn OFF the refrigeration system & vacuum pump.
3.
Position the “Vac Release” valve to OPEN (or open one of the sample
valves on the left side of the unit).
4.
Allow the vacuum to bleed to atmospheric pressure, then open the door
and remove the samples.
5.
Defrost the ice, drain the collector pan and dry.
Freeze Drying Using Sample Valves
(In-Flask Mode)
The In-Flask mode is used to freeze dry pre-frozen samples when using ONLY the
sample valves on the left side of the unit. There is no shelf temperature control in
this mode. The refrigeration system will only cool the collector. The following
procedure should be followed when using the sample valves to freeze dry:
1.
Go to the Home screen and press MANUAL, then select In-Flask.
2.
Once the collector temperature is less than –80°C and vacuum is less than 0.133
mbar, connect a pre-frozen sample to a sample valve on the left side of the cabinet
using an adapter. Turn the plastic valve knob to the “VACUUM” position to
open the valve. The bevel on the knob should be positioned toward the sample
port to apply vacuum to the sample.
3.
Before adding another sample, allow system vacuum to return to the
vacuum set point. 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,
primary drying is nearly complete. To be certain of low final moisture
content, dry the sample for several hours past this point.
