Chapter 5: Using Your Freeze Dryer
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41
Original instructions
Never attempt to start the vacuum pump when there is liquid in
the collector chamber. This could result in damage to the
vacuum pump.
Operating the Shell Freezer
(optional feature)
The optional built in shell freezer is designed for shell freezing samples in flasks in
preparation for freeze-drying.
Follow the steps below each time you use the shell freezer to obtain optimum
performance:
1.
Ensure that the shell freezer drain fitting has been removed from the quick
connect drain coupling on the front of the Freeze Dryer.
2.
Remove the shell freezer lid and add solvent to the bath compartment.
Commonly used solvents are methanol or ethanol. Recommended solvent depth
is ¼" to ½" above the top of the rollers (approximately 2 liters).
If flammable solvents are used in the shell freezer bath, be sure to
keep away from open flame.
3.
Press the “
SHELL FREEZER
” button, then press the “Start” button. The blue
indicator bar above the button will illuminate. The shell freezer refrigeration
module will start and the bath rollers will begin rotating. The shell freezer bath
temperature will be displayed on the Home screen (and Sensors screen).
4.
Fill a freeze dry container no more than 1/3 full with sample and stopper the container
top. Lay the container on the rollers in a horizontal position. Replace the shell freezer
lid during shell freezing.
5.
When the sample is completely frozen in the container, remove the container from
the bath compartment and freeze dry the sample or place it in a suitable storage
freezer for future freeze drying.
6.
Press the “
SHELL FREEZER
” button, then press the “Stop” button to turn the
shell freezer off.
7.
If the Shell Freezer is to be used for cold bath operation, additional solvent
may be added to submerge small flasks. Do not fill pan more than 2 inches
below the top of the stainless steel pan with vessels submerged. Allow
additional time for larger volumes of solvent to pull down in temperature.
8.
Always drain flammable solvents from the bath when the shell freezer is not in
use and store the solvent in a suitable container. This is accomplished by
inserting the drain fitting into the quick connect drain coupling labeled “
SHELL
FREEZER
” on the front of the Freeze Dryer. Place the drain hose in a suitable
container to collect the solvent.
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