SP Scientific LYOSTAR II, Руководство оператора

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Rev 012, 04/11 31
© SP Scientific 2011
Chapter
5
Optional Liquid Nitrogen Trap-Auto
Filling
Overview
The auto filling liquid nitrogen trap (LNT-LYOII) is sold as an option to protect the
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
auto filling liquid nitrogen trap is connected to a LyoStar II when it is important to trap
these high vapor pressure solvents. Typically, these solvents come off the product
early in the drying cycle. During this time, the trap can be valved so that it is on line.
The trap can be valved off line when the high vapor pressure solvents are gone. This
is indicated by a decrease in the system pressure. This will allow the most economical
use of liquid nitrogen.
Before attempting to operate the system, read and completely familiarize all personnel
with Safe Handling and Storage of Liquified Gases and the Liquid Level Controller
Manual.
The liquid level controller comes with a thermistor type level sensor that will maintain
between 1 and 4 inches of liquid nitrogen in the reservoir. There are low and high
level alarms preset at 0 and 6 inches. See the liquid level controller manual for
operating details.