SP Scientific Freezemobile Series, Operator'S Manual, Page: 25 / 54

VirTis Freezemobile 25L and 35L Sentry 2.0 Controls
Rev 005, 02/12 15
© SP Scientific 2012
Calibration
The Calibration screen allows modification and control of condenser temperature and
vacuum settings. The following procedures require removal of the electrical box cover
under the unit’s right-side panel.
CAUTION! REMOVAL OF THE ELECTRICAL BOX EXPOSES HIGH-VOLTAGE COMPONENTS.
USE EXTREME CAUTION AND FOLLOW ELECTRICAL SAFETY PRACTICES.
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Calibration
Temperature Span 070
Temperature Zero 14.5C 128
Vacuum 760 Torr 128
Condenser Temperature Calibration
To calibrate the condenser temperature:
1. Connect a thermocouple temperature simulator to the condenser temperature
input. Set the simulator temperature to 25 °C.
2. The current temperature is displayed on the Calibration screen. Adjust the
numerical value of the Temperature Zero up to increase the temperarture.
Adjust the Temperature Zero down to decrease the temperature. Press the
MENU button to enter the value.
3. Upon proper adjustment of the Temperature Zero, change the temperature
simulator value to -60 °C. Adjust the Temperature Span value so that the
temperature displayed equals the calibrator set value. Recheck the value at
25 °C, and repeat adjustment if necessary. Check calibration at desired
temperature intervals for verification.