The LFT series of feedthroughs are used for the transfer of fluids (or gases) through a Conflat flange into, or out of, a vacuum system. Typical fluids transferred include water, Freon, or liquid nitrogen.

The LFT feedthroughs comprise one or two separate stainless steel tubes, each terminating in a UHV leak tight connection on the vacuum side of the LFT. Several sizes of tube bore are offered to fulfill different requirements. All of the LFT’s have been designed with a thermal break on the atmospheric side of the tube. This comes into action when using liquid nitrogen as it forms a long heat  path between the tube and the mounting flange. This results in less heat being absorbed by the liquid nitrogen (reducing losses). It also results in less cooling of the mounting flange which means  that less condensation forms around the conflat flange. This reduces any corrosion that may form in this area when used over a long period of time, and so reduces the chances of contamination or leakage occurring.