Thermocouple (Type-K) - Ultrahigh (UHV) High In-Vacuum (HV)
Thermocouple (Type-K) Power-D 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, Chromel® / Alumel® 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 (UHV) vacuum cable assemblies with PEEK (polyetheretherketone) connectors and Kapton® insulated wires are available to meet the demands of UHV environments.
In-vacuum cable assemblies, individual connectors, and other accessories are available from the links below. Available in both UHV and High Vacuum (HV) configurations.
Custom thermocouple-power feedthrough flange and cable assemblies are available on request.
Thermocouple Type-K Feedthrough Specifications
Thermocouple Pins - Voltage, Maximum
Power-D Pins - Voltage, Maximum
Thermocouple Pins - Current, Per Pin Maximum @ 20ºC
Power-D Pins - Current, Per Pin Maximum @ 20ºC
Millivolts 500 VDC Milliamps 20 Amps
* For proper heat dissipation, a maximum of 20% of the pins on a feedthrough may carry the maximum pin current at any given time.
Thermocouple Type-K Feedthrough Material Specifications
-200ºC to 250ºC -200ºC to 450ºC -26ºC to 150ºC 80ºC 250ºC 25ºC / Minute Maximum
* Overall assembly ratings must be adjusted to that of the lowest-rated component.
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 Chromel® wires and negative Alumel® 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.