MicroCal VP-ITC User Manual page 23

STIRRER
This switch will activate a rotating magnetic field that will stir your sample when a small
magnetic stir bar is placed in the tube containing your sample. You may adjust the speed of the
Stirrer motor from 0 RPM (OFF) to the maximum speed of 800 RPM (full turn clockwise).
ADJUSTABLE VACUUM BLEEDER
Allows manual adjustment of the vacuum strength within the degassing chamber of the
ThermoVac.
There is no vacuum gauge on the ThermoVac, but the strength of the vacuum may need to be
adjusted based on the behavior of your samples under vacuum. Depending on the specific sample
being degassed, and on the temperature of the sample, the vacuum strength might be enough to
boil the sample and subsequently change the concentration and/or spill the sample. This may be
avoided by adjusting the strength of the vacuum with the bleeder screw. By turning the top of the
bleeder screw in the counter-clockwise direction you will lower the strength of the vacuum within
the ThermoVac and avoid boiling your sample. Similarly, the vacuum strength can be increased,
by turning the top of the bleeder screw in the clockwise direction. The bleeder screw (and
vacuum strength) can be fixed in a desirable position by tightening the lower nut, located at the
base of the bleeder screw assembly, all the way in the clockwise direction.
REAR PANEL
1. Power Main Switch
2. 2 Power Fuses
3. IEC Inlet Power Receptacle
4. Vacuum Port
5. Pressure Port
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Section 1: VP-ITC System Introduction