SP Scientific VIRTIS ADVANTAGE PRO, Operator'S Manual, Page: 40 / 78

Appendix A: Troubleshooting VirTis AdVantage Pro
30 Rev 002, 01/14
© SP Scientific 2014
If you do not get a normal vacuum reading on the front panel display or vacuum
gauge within 15 to 30 minutes, start checking components in the following order:
Change the vacuum pump oil. 1.
Note: For instructions on changing vacuum pump oil, refer to the Changing Vacuum
Pump Oil section of Chapter 6: General Maintenance and/or the
operator’s manual for
your specific vacuum pump.
Inspect vacuum tubing for excessive wear ( e.g ., cracking or dried 2.
appearance).
Note: For instructions on inspecting vacuum tubing, refer to the Vacuum Tubing
section of Chapter 6: General Maintenance.
Check all threaded and welded connections and seal with vacuum sealant. 3.
If poor vacuum persists or testing vacuum with a second, calibrated gauge indicates a
good vacuum reading, the problem is likely related to the vacuum probe. Replace the
vacuum probe tube and retest.
Note: If the vacuum problem is not resolved after checking these components (i.e., 1 - 3),
contact SP Scientific. .
Product Melting
The most common reason for product melting is insufficiently low vacuum pressure.
Adequate vacuum is required to keep products in a frozen state. Check for a vacuum
leak or possible restrictions in the vacuum hose as described above.
If the unit is functioning properly, but the product is still m
elting, the product’s freezing
point (eutectic temperature) may be too low to remain in a frozen state. Re-test using
a water sample to determine if a mechanical or product-related problem exists.