Feedthroughs provide inlet and outlet tubes through the walls of a pressurized or vacuum system through a hermetic seal, while maintaining the integrity of the vacuum. Different styles of feedthroughs are designed to transmit electrical current, fluids, optical signals, or mechanical motion through the walls of a vacuum system Feedthroughs can be broken down into four rough categories (each of which has a separate, more specific Search Form), electrical, fluid, mechanical and fiber optic. Electrical feedthroughs transmit electrical current through the walls of a vacuum system. This grouping includes coaxial, multi-pin (instrumentation), RF, thermocouple, and power feedthroughs. Fluid feedthroughs include nitrogen, air, and water devices. Many of these feedthroughs are designed for use with cryogenic systems. Mechanical feedthroughs includes linear, rotary, and linear / rotary feedthroughs. Fiber optic feedthroughs are available in unlimited cell, flange, and port designs and are ideal for a wide range of wavelengths.
There are many important specifications to consider when selecting a feedthrough. These include the mounting configuration, bearing type and position, the shaft size, strength and termination features, the residual magnetic field, the pressure vacuum rating; and for fluid feedthroughs, the type of fluid to be passed through the system and the location of sealing stages to ensure system stability. Additionally, one must consider the diameter of the tubing that will be used and the diameter of the holes though which the feedthrough will be mounted.
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