SP Scientific VirTis BenchTop Pro Series, Operator'S Manual, Page: 27 / 66

VirTis BenchTop Pro Accessories and Options
Rev 002, 01/14 19
© SP Scientific 2014
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:
Enable the condenser and wait for the system to reach normal operating 1.
temperature.
Remove the plastic cover from the stainless steel vessel and add a small 2.
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.
Replace cover and wait one (1) minute. 3.
Open the center well and slowly fill it with liquid nitrogen (2.8- or 5-liters, 4.
depending on capacity).
Open valves 1 and 2, and close valve 3 (see diagram). 5.
Enable the vacuum and wait until vacuum pressure reaches 100 mT. 6.
The trap is now in operation. Over time, Liquid Nitrogen evaporates rapidly 7.
and solvent is condensed. Check center well often and refill with liquid
nitrogen as needed.
WARNING! LIQUID NITROGEN CAN CAUSE SEVERE CRYOGENIC BURNS. EXERCISE
CAUTION WHEN HANDLING. WEAR PROTECTIVE GLOVES AND AVOID SKIN CONTACT.
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2
1 3
3
1
Top View
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Pump
To
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