SP Scientific VIRTIS 2K - Appendix A: Troubleshooting Common Issues; Vacuum Problems and Product Melting Solutions

V
irTis BenchTop 2K, 4K and 6
K
Optional Components
Rev 007, 10/11 29
© SP Scientific 2011
Liquid Nitrogen Trap
The optional Liquid Nitrogen (N
2(liq)
) Trap protects your vacuum pump from the
corrosive properties of acid and alkaline vapors, as well as the low temperatures and
organic solvents associated with the freeze-drying process. The trap is available in
both 2.8- and 5-liter capacities.
To operate a liquid nitrogen trap:
1. Enable the condenser and wait for the system to reach operating
temperature.
2. Remove the plastic cover from the stainless steel vessel and add a small
amount of liquid nitrogen to the center well. If adding liquid nitrogen from a
tank, use adequate ventilation to protect from gaseous vapors.
Note: The liquid nitrogen will expand and bubble when it meets the warm center well.
Wear protective eyewear and gloves to avoid contact with skin.
WARNING! LIQUID NITROGEN CAN CAUSE SEVERE CRYOGENIC BURNS. EXERCISE
CAUTION WHEN HANDLING. WEAR PROTECTIVE GLOVES AND AVOID SKIN CONTACT.
3. Replace cover and wait one minute.
4. Open center well and slowly fill with liquid nitrogen (2.8 or 5 liters, depending
on capacity).
5. Open valves 1 and 2, and close valve 3 (see diagram).
6. Enable the vacuum and wait until vacuum pressure reaches 100 mT.
Side View
2
1 3
3
1
Top View
To Vacuum
Pump
To BenchTop