Labconco FreeZone Clear Stoppering Chambers - Manual (Page 24)

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Chapter 4: Using Your Clear Stoppering Chamber
Product Service: Domestic 1-800-522-7658, International 816-333-8811
Setting the Shelf Temperature
A specific temperature cannot be selected and set. The
voltage and duty cycle of the heater is determined by the
Heat Range Switch and Heat Level Switch. When the Heat
Range Switch is positioned to HIGH, the voltage to the
heaters is twice as high as when the switch is in the LOW
position. The Heat Level Switch varies the heater on duty
cycle from about 20% when the dial is set at the 1 position
to 100% when the dial is set at 9. A temperature thermostat
built into the heater limits the high temperature to about
46° C (115° F).
The actual temperature of the shelf/sample is dependent on
the sample material and quantity, the vacuum level in the
system, as well as the settings of the Heat Range and Heat
Level controls. The samples must be observed during the
freeze drying process to confirm that they did not melt
during the process.
Stoppering
When the samples are dry they may be stoppered while still
under vacuum.
1. Turn off the shelf heater.
2. Turn the shelf stoppering crank counterclockwise to
lower the stoppering plate.
3. When stoppering is complete turn the crank clockwise
to raise the stoppering plate to its original position.
4. Slowly open the vent valve on the top to allow air to
bleed into the chamber.
5. Turn off the vacuum pump.
6. Rotate the stoppering assembly counterclockwise and
then remove it. Remove the clear chamber.
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