Labconco FreeZone Bulk Tray Dryer 78060 Series - Manual (Page 17)

Chapter 4: Using Your Bulk Tray Dryer
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3. Check the collector chamber drain hose on the Freeze Dry System to
ensure that the hose is free of moisture and that the drain plug is securely
installed.
4. Using a soft, lint-free cloth or paper towel, wipe the Freeze Dry System
collector chamber lid gasket and the Bulk Tray Dryer door gasket to
remove any dirt and contaminants that could cause a vacuum leak.
Vacuum grease is not required on the door gasket to obtain a proper
vacuum seal.
5. Inspect each sample valve on the shelf manifold if the tray dryer is so
equipped, on the manifold and check for any visible damage and for
improper installation that might cause a vacuum leak. Also check that
each sample valve is closed or in the “vent” position.
Operating the Bulk Tray Dryer
1. Adjust the shelf spacing - Prior to loading the shelves with the product to
be freeze dried, adjust the shelf spacing to accommodate the size and
quantity of the samples. The Bulk Tray Dryer comes equipped with three
heated shelves and two additional accessory shelves may be added. At
least one shelf must be used and any number of shelves up to five may be
used. Shelves may be positioned in any of the five available positions. To
change the position of a shelf, first disconnect the temperature probe
connector inside the left side of the chamber, then grasp the front of the
shelf and pull it forward to remove it. The shelf may then be repositioned
at another shelf support position being certain to push the shelf fully into
the chamber to ensure a positive electrical connection to the heaters. Plug
the temperature probe connector into the receptacle corresponding to the
new shelf position.
2. Position the temperature probe - The temperature probe is installed at the
factory into a block on the bottom of the shelf. In this position, the actual
temperature of the shelf will be controlled and shown on the display. If it
is desirable to monitor and control the process based on sample
temperature, the probe may be removed from the block and placed directly
into the sample container. Carefully pull the sensor out of the block by
grasping the stainless steel tube and pull straight out. Do not pull by the
wires, as damage will occur. The electrical connector for the probe must
be connected to the receptacle corresponding to the shelf holding the
sample.
NOTE: Shelf temperature may be controlled by the Bulk Tray Dryer and sample
temperature may be monitored simultaneously. Plug the probe that is installed in
the block on the bottom of the shelf into the corresponding receptacle. Place a
second probe in the sample and plug its connector into an unused shelf receptacle.
The sample temperature will be displayed at the unused shelf position on the
display.