Labconco FreeZone 6 Liter Benchtop Freeze Dry Systems 77520 Series - Manual (Page 22)

18
Chapter 4: Using Your Freeze Dryer
Product Service: Domestic 1-800-522-7658, International 816-333-8811
5. Inspect each sample valve on the accessory drying chamber or
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.
Vacuum Pump Ballast Setting
Most vacuum pumps are equipped with a gas ballast mechanism.
The freeze dry process requires high vacuum. Therefore, it is
recommended that the gas ballast be closed during the operation of
the Freeze Dry System. If the gas ballast is left open for extended
periods of operation, the oil can be pumped out the exhaust,
causing the pump to fail.
Operating the Freeze Dryer
Set-Up
The Freeze Dryer may be configured to automatically start the
vacuum pump when the collector temperature reaches –40°C. The
display units for vacuum may be selected to be mBar, Pascal (Pa)
or Torr and the temperature may be displayed as °F or °C. The run
time of the refrigeration system and the vacuum pump may be
monitored.
To configure your Freeze Dryer, turn the main power switch ON
and press MENU. The display will show:
• Press SELECT until the desired units are flashing.
• Press MENU.
• The display will show:
Where YYY is the units selected above.
VACUUM UNITS
mBar
Pa Torr
VACUUM SET POINT
XXXX
YYY