Labconco FreeZone 2.5 Liter Freeze Dry Systems 76705 Series - Manual (Page 24)

Chapter 4: Using Your Freeze Dryer
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Baffle
The cylindrical plastic component shipped with Cascade Freeze Dryers (Models
76700XX and 74200X) is a baffle, which is designed to evenly distribute collected
ice over the entire collector coil. Proper positioning of the baffle is required to
achieve maximum ice loading capabilities.
The baffle installs into the collection chamber with the flat flange upward. The
large boss on the flange should be positioned toward the rear of the chamber. The
arrow should point toward the front of the Freeze Dryer.
Automatic Start-Up
To run the Auto Mode, press the panel switch labeled REFRIGERATION AUTO.
The green LED above the switch will illuminate. This will start the refrigeration
system. When the collector reaches –40°C, the vacuum pump will start. The
Temperature and Vacuum Graph will indicate collector temperature and system
vacuum. The LCD display will show the actual temperature of the collector.
When the vacuum in the system is above 5 mBar the vacuum display will indicate
“HI.” At 5 mBar and below, the display will show the actual vacuum.
When the system vacuum is between 0.450 and 0.133 mBar, the lower green
vacuum graph LED will flash. When the system vacuum level is <0.133 mBar, the
green LED will be lit steadily indicating that most samples may be added.
Manual Start-Up
To manually run the freeze dry process press the REFRIGERATION MAN switch.
This will start the refrigeration system. The green LED above the switch will
illuminate. When the collector temperature reaches –40°C, the vacuum pump may
be started by pressing the VACUUM switch. The Temperature and Vacuum
Graph will indicate collector temperature and system vacuum. The LCD display
will show the actual temperature of the collector. When the vacuum in the system
is above 5 mBar the vacuum display will indicate “HI.” At 5 mBar and below, the
display will show the actual vacuum.
When the system vacuum is between 0.450 and 0.133 mBar, the lower green
vacuum graph LED will flash. When the system vacuum level is <0.133 mBar, the
green LED will be lit steadily indicating that samples may be added.
Setting the Operating Vacuum Level
The vacuum level may be set by the user to optimize the freeze dry process.
Normally, the sublimation rate will increase if there is less vacuum (a higher
pressure) in the Freeze Dryer. A good starting place is to set the vacuum so its
level is equivalent to about 10°C colder than the eutectic or collapse temperature