Chapter 4: Operating Instructions
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26
Freeze Drying Using Manifold Valves
The following procedure should be followed when using the sample valves
for the freeze dry process:
1.
Turn on the Triad Freeze Dry System. Select manual mode, change the set
point temp to “IN-FLASK” and turn on the vacuum.
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. (see
Figure 4).
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.
Figure 4
