Chapter 5: Using Your Freeze Dryer
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37
Original instructions
Manual Mode with Unfrozen Samples
1.
Place unfrozen samples on the shelf and close the door. The sample probe
can be placed in the sample if desired.
2.
Start the refrigeration system by pressing MANUAL, then select Max Cold
or enter a Shelf Temp Set Point (depending on the desired shelf
temperature), then press Start.
3.
Make sure the vacuum is turned OFF.
THE VACUUM SHOULD ALWAYS BE TURNED OFF WHILE
USING THE SHELVES TO FREEZE SAMPLES
4.
The shelf will cool to the entered set point value (or approx. –75°C in Max
Cold mode).
Note:
With the system starting at room temperature, it will take
approximately 6 hours to freeze a 2 liter tray of water in Max Cold
mode.
5.
When the sample is frozen, change the shelf set point to the desired
temperature.
6.
Turn on vacuum.
7.
Shelf set point temperature and vacuum set point can be changed at any
time during the manual freeze dry process.
Program Mode with Pre-Frozen Samples
The shelf should be pre-cooled to the desired temperature before placing pre-
frozen sample on it for freeze drying. Pre-cooling the shelf can be done with either
the Manual or Program mode (Manual mode has been detailed above). You can
access the Programs screen from two different buttons, both lead to the same
location:
