Instrumentation Vacuum Feedthroughs

Pfeiffer Vacuum Valves & Engineering's extensive line of electrical feedthroughs is manufactured from ultra-high vacuum-grade materials such as high alumina ceramic insulators, OFHC® copper and nickel conductors, and 304 stainless steel flanges. These robust ceramic to metal feedthroughs have electrical ratings for operation, with one side in a dry atmosphere while the opposite end is in a stable vacuum. They are used in ultra-high vacuum systems with CF flanges or high vacuum systems with NW flanges. CF feedthroughs can be baked to 450°C and NWs to 204°C with a maximum system pressure of 1 x 10^-4 Torr. Our product line comprises the most commonly required feedthroughs for general vacuum applications. Customs designs or modified standards can readily be supplied. Liquid and liquid nitrogen feedthroughs include the most commonly required for general, high, and ultra-high vacuum applications. Tubing is .25 and .375 inch OD, type 304 stainless steel with CF or NW flanges. They are available without fittings or terminated with industry standards.

Swagelok^® or Cajon^® VCR tube fittings. Maximum bakeout with CF flanges is 450°C and 204°C with NWs. Vacuum ranges are 10^-11 Torr and 10^-8, respectively. Water-cooled liquid feedthroughs are a cost-effective and reliable way to introduce water into a vacuum system. The .035-inch single-wall tube construction is designed to transmit water as a cooling agent. Liquid nitrogen feedthroughs are constructed with dual and coaxial tube geometries. This thermal barrier effectively reduces condensation and ice buildup on the atmosphere side of the feedthrough around the mounting flange interface, protecting the seal’s integrity. This is necessary because of the extreme thermal gradients encountered with liquid nitrogen.