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Thermocouple (Type-K) Subminiature-D Feedthroughs

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

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

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.