SP VirTis BenchTop 2K, Руководство оператора

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VirTis BenchTop 2K, 4K and 6K Optional Components
Revision 004, 12/09
31
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 Vacuum
Pump
To
Condenser
Vacuum bypass assembly with
lever-activated ball valves
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.
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 above).
6. Enable the vacuum and wait until vacuum pressure reaches 100 mT.
7. Trap is now in operation. Liquid Nitrogen evaporates rapidly over time and
solvent is condensed. Check center well often and refill with liquid nitrogen as
needed.
© SP Industries, Inc. 2009