SP Scientific Freezemobile Series, Operator'S Manual, Page: 20 / 54

Sentry 2.0 Controls VirTis Freezemobile 25L and 35L
10 Rev 005, 02/12
© SP Scientific 2012
Bath (Optional)
Enabling the Bath function directs cooling to the optional Shell Bath module for
freezing products prior to freeze-drying. The temperature of the bath will be displayed
on the Synoptic screen.
Note: This feature will only be displayed if a factory-installed Shell Bath module was purchased
with your unit.
Purge (Optional)
Enabling the Purge function closes the purge valve located between the vacuum
pump and the suction port of the unit. This allows a high vacuum to be pulled within
the volume between the pump and the valve without the entire unit being under
vacuum. The gas ballast within the pump can then be opened to cleanse the pump oil.
Note: This feature will only be displayed if the purge option was purchased with your unit.
Heat (Optional)
The Heat function gives the ability to add controlled heat to product shelves for
enhanced drying. If installed, you can set the temperature of the manifold shelves up
to 50 °C.
Note: This feature will only be displayed if the shelf heat option was purchased with your unit.
User Options
To access the User Options, select User Options from the Main Menu and press the
Menu button.

User Options
Vacuum Control VLC
Temperature Units C
Vacuum Units Torr
Relay Test

Vacuum Pump Maintenance

Vacuum Control
The Vacuum Control field sets the method used for vacuum level control: None, VLC
or Power Save.

Setting Vacuum Control to None disables vacuum level control.

Setting Vacuum Control to VLC allows gas to bleed into the system through a
control valve to maintain the vacuum setpoint.

Setting Vacuum Control to Power Save isolates the system and maintains
pressure by shutting off power to the vacuum pump and VBS valve. As the
system pressure rises, the vacuum pump is re-energized and the system is
pulled back down. To avoid rapid cycling of the vacuum pump, the Power
Save Deadband should be set to 20 or more.