SP Scientific Freezemobile Series, Operator'S Manual, Page: 26 / 54

Sentry 2.0 Controls VirTis Freezemobile 25L and 35L
16 Rev 005, 02/12
© SP Scientific 2012
Vacuum Value
To adjust the Vacuum value:
1. Open the condenser door and adjust the trim pot located on the main Sentry
2.0 module within the electrical box.
2. Set the value to 760 Torr, or current atmospheric pressure.
3. Turn the trim pot clockwise to increases the pressure or counter-clockwise to
decrease the pressure.
4. Once the rough vacuum has been set, connect a reference tube.
5. Adjust the Vacuum value located on the LCD screen up to increase the
Vacuum reading. Adjust the Vacuum value down to decrease the Vacuum
reading.
Note: SP Scientific recommends the use of a Varian Vacuum Reference Tube for
vacuum calibration.
PRACTICAL OPERATING TIP. ENSURE THAT THE GROUND WIRE IS FIRMLY CONNECTED
BEFORE CALIBRATING ANY VALUES. A LOOSE GROUND WIRE CAN PRODUCE
INCONSISTENT AND UNPREDICTABLE RESULTS.
Turn vacuum trim pot here