Thermocouple / Power hermetic subminiature-D feedthroughs are mixed thermocouple-power contact combinations fitted on one feedthrough assembly constructed with pin arrangements designed to meet IEC 807-2 and DESC 85039 specifications.
Standard configurations include power pins, ChromelŽ / AlumelŽ Type-K thermocouple pin pairs and combinations in a single subminiature-D shell. Straight through pins are hermetically sealed and electrically insulated in a stainless steel shell using the latest in glass-ceramic bonding technology. Ultrahigh vacuum cable assemblies with PEEK (polyetheretherketone) connectors and KaptonŽ insulated wires are available to meet the demands of UHV environments. Vacuum side cable assemblies, individual connectors, and other accessories are available from the links below. Custom thermocouple-power feedthrough flange and cable assemblies are available on request.
Thermocouple feedthroughs do not measure temperature but merely provide a conduit to bring the EMF signal generated at a thermocouple junction through a vacuum vessel wall to an external voltage measuring or temperature readout instrument. Type-K thermocouples with positive ChromelŽ wires and negative AlumelŽ wires are recommended for use in clean oxidizing atmospheres. The maximum operating temperature for these alloys is 1260°C for larger wire sizes. The useful temperature measuring range for a Type-K thermocouple is between -200°C to 1250°C.
Note that Alumel is Magnetic, while Chromel is Non-Magnetic
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Thermocouple - Type-K Vacuum