These Ideal Vacuum fiber optic feedthroughs are mounted through a KF-25 vacuum flange. The multimode step-index fiber has a low OH, Ø100 µm core, is capable of transmitting 1 W of optical power in the wavelength range of 400 - 2400 nm. The fiber has a numerical aperture (NA) of 0.22 and is equipped with standard SMA-905 connections on both the vacuum and air sides. Two stainless-steel SMA caps are included with every fiber optic feedthrough to protect the fiber optic faces from contact and contamination.

(KF) flanges are normally used for processes requiring high vacuum pressures, down to 10^-8 Torr, and are typically sealed with a rubber O-ring seal using a hinge clamp and centering ring. These KF flanges are made of 300 series corrosion-resistant stainless-steel.

TYPES of FEEDTHROUGHS

OPTICAL:
Optical feedthroughs transmit light from outside to inside the vacuum chamber. There are two main types of optical feedthroughs: windows and fiber optic feedthroughs. Windows may be sealed by elastomer O-rings or by hermetic glass-to-metal connections. Fiber optic feedthroughs are always hermetically sealed. There are a variety of window and fiber optic size, material, and configuration options available. Optical feedthrough design considerations include the power density, wavelength range, polarization, and divergence of the light as well as the base pressure and envornmental conditions of the chamber. If you require optical feedthroughs of a size, material, or configuration that is not found on our website or are unsure of your process requirements, do not hesitate to contact us for a consultation and custom quote.

POWER:
Power feedthroughs are a type of electrical feedthrough that transmits electricity from atmosphere (outside) to vacuum (inside). Power Feedthroughs have one or more conductors entering the vacuum device chamber walls. The conductors are sealed to an electrical insulator that are either welded to or connected via a vacuum flange or baseplate. Conductor metal comes in wire, rod, or tubes. Conductor material is based on current, corrosion resistance, and magnetism. Things to consider for selection are operating voltage, maximum current, base pressure, and the working environment. Never under specify voltage or current, this may cause arcing, melting or insulator break down. When selection is in doubt, please call us.

THERMOCOUPLE:
A Thermocouple Feedthrough is a robust and cost-effective temperature sensor used in a wide range of temperature measurement processes. When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in the thermoelectric circuit. If this circuit is broken at the center, the net open circuit voltage (the Seebeck voltage) is a function of the junction temperature and the composition of the two metals. Which means that when the junction of the two metals is heated, or cooled, a voltage is produced that can be correlated back to the temperature. When properly configured, thermocouples can provide measurements over a wide range of temperatures.

They can contain one or more pairs of wires and have molded plugs, push ons, split connectors and could have lugs or screw connectors on the inside (vacuum) or outside (atmosphere). Things to consider are temperature range, number of temperature locations, sheath material, wire diameter, metal type, and power conductors within the same feedthrough. There are many types of thermocouple feedthroughs made with many different metals having different temperature ranges. When selection is in doubt, please call us.

INSTRUMENTATION:
Instrumentation Feedthroughs also known as multipin feedthroughs transfer electrical signals and/or low power applications across the vacuum wall. They are used in instrumentation applications such as electron microscopy, surface analysis and semiconductor process controls. They can be made up of electrical connectors with pins or coaxial on either side of the vacuum wall, inside (vacuum) or outside (atmosphere). Things to consider before selection are maximum voltage cable to shield, maximum voltage shield to ground, signal voltage, grounding, impedance, temp range, number of connections, type connectors etc. It is very important when ordering to make sure you have the right connectors supplied or not supplied with the order. Many types of instrumentation connection feedthroughs, when in doubt please call us.

LIQUID or GAS:
Liquid or Gas Feedthroughs delivers a gas or liquid to a vacuum mounted device or chamber. This gas or liquid could maintain a certain temperature within the evacuated chamber. They can be ordered in CF or KF flanges or baseplate ports that have one or multiple tubes welded to through-holes, with tube extending out on both sides of the flange/baseport. The tubes have various diameters and are often terminated with a small flange or gas fitting. Things to consider are flanges that match unused flanges on walls of device, number of feedthroughs, tube diameter, feedthrough entry port sizes and terminations that match both side components. When in doubt please call us.

ROTARY MOTION:
Rotary Motion Feedthroughs are air-side shafts that rotate a vacuum-side shaft. Several types of rotary drives exist, differentiated by actuator mechanism, vacuum sealing, compatible pressure range, and application. Two types are Elastomer sealed that use back to back double O-rings for sealing and Ferro-Sealed using ferrofluid O-Ring technology for higher RPM and high torque capacity. Feedthroughs can provide repeatable movement or coarse positioning and may provide rotary motion, linear motion or a combination of both. A number of actuation designs are available, from manual turn, to pneumatic, to electrical motorized. When in doubt please call us.

ACCESSORIES:
Feedthroughs may require extra hardware to make the required connections. We carry cabling, electrical/coax connectors, and pins for inside and outside your vacuum chamber. Not sure of which accessory to purchase, please call us.