Thermocouple Vacuum Feedthroughs & Components

Thermocouple Type-K - Ultrahigh (UHV) High In-Vacuum (HV), drawing

TYPE-K Thermocouple Vacuum Feedthroughs

Thermocouple 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 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

500 VDC
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
  • Shell
  • Thermocouple - Pins (+)
  • Thermocouple - Pins (-)
  • Power - Pins
  • Seal / Insulator
  • Connector, Air
  • Connector, Vacuum

304 Stainless Steel
Au plated, Ni-Fe alloy

*  Peek is a Polyether-ether-ketone thermoplastic. 
Feedthrough Vacuum Range Specifications
Vacuum Range 
  • UHV, Ultrahigh vacuum
  • HV, High vacuum

1x10-10 Torr
1x10-8 Torr
Feedthrough Temperature Range Specifications
Temperature Range 
  • Feedthrough
  • Flange Mount, Conflat
  • Flange Mount, ISO
  • Connector / Cable, Air
  • Connector / Cable, Vacuum
  • Thermal Gradient

-200ºC to 250ºC
-200ºC to 450ºC
-26ºC to 150ºC
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.