GC_LabUser wrote:
Hello,
I am planning on using a LN2 dewar for liquid cooling on an Agilent 8890 with capillary columns.
Maybe this is a dumb question, but will I be connecting my regulator to the liquid valve? Where did you find your liquid regulator?
I called a supplier and they were confused when I mentioned a liquid regulator.
Thanks
For doing cryo cooling with liquid N2, you connect to the port on the dewar listed Liquid with a direct insulated line, do not use the one labeled gas with the CGA fitting. Normally the connection is a 1/4" line, normal swagelok connector at the instrument and whatever the fitting is at the dewar. Usually at the dewar they supply it with a flare fitting, but we always took that out and had one that adapted to 1/4" swagelok.
The dewar will control the pressure and it will stay low enough that you don't need an external regulator. If the pressure drops too low, then you have to open the valve labeled Pressure Building which will allow the Liquid to circulate and warm and the pressure will increase.