High temperature thermocouples

High temperature thermocouples, also called exotic thermocouples, are used in applications where base metal thermocouples cannot be used because of extreme temperatures up to 2300°C and hazardous environments.

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Product summary

Suitable for temperatures up to 2300°C
Suitable for vacuum, inert, oxidizing and reducing atmospheres
Transition style thermocouples available to reduce costs
Wide variety of termination options available
Long term stability
Various additional tests available to validate integrity

For hazardous environments up to 2300°C

Configuration of exotic thermocouples

These thermocouples are made with rugged construction to ensure stable and precise temperature measurement. The most important part of the configuration is choosing the design, thermocouple wires, and sheath material. This combination ensures the thermocouple can withstand the environment it is used in and determines the costs.

Two product examples of high temperature thermocouples

Thermocouple wires

The high-temperature thermocouples that can withstand the extreme temperatures or extreme environments are usually Type S, Type R, Type B, C or D thermocouples.

While platinum thermocouples have their limitations, exotic thermocouples like Type C and Type D are specifically designed to excel in temperatures and conditions that surpass the capabilities of platinum.

Avoid the usage of Type C and Type D thermocouple wires in the presence of elevated temperatures combined with oxygen, nitrogen, or hydrogen due to the risk of embrittlement.

Sheath material

Depending on the environment and temperature range, various sheath materials are offered for this type of thermocouple.

For the lower temperature range, Inconel 600 is a possibility. For mid-range temperatures, Pt10%Rh and Pt20%Rh are options. For temperatures up to 2000-2200°C, Molybdenum, Tantalum, or Niobium 1% Zirc are suitable.

Transition style thermocouples

When exotic applications require long thermocouples with expensive noble metal or refractory sheaths, ARi can supply custom made transition style thermocouples for substantial cost savings.

Thermocouples can be supplied with suitable high temperature “hot section” sheath and insulating materials long enough to reach a cooler zone in the furnace or reactor. At this point, a brazed transition can be made to a less expensive thermocouple or compensating material with Inconel 600 or stainless-steel sheath.

Why choose
ultra high temperature thermocouples
from Kamet?

Wide variety of termination options available
Long term stability
Various additional tests available to validate integrity. Like special non-destructive testing with ARi Industries standards.
Robust hot junction on Type C & D through patented wire wrap / welding procedure
Custom material combination and sizes to meet demanding applications
Transition style thermocouples available to reduce costs

Extreme temperature solutions for Europe and the Middle East

Industrial uses of high temperature thermocouples

Ultra high temperature thermocouples find extensive industrial applications, particularly in demanding environments such as high temperature vacuums furnaces, reducing or inert atmospheres.

These atmospheres present unique challenges.

In vacuum atmospheres, maintaining thermocouple integrity without air pressure is crucial.
Reducing atmospheres, rich in hydrogen or carbon monoxide, demand materials that resist carburization.
Oxidizing environments require thermocouples that can withstand oxidation at high temperatures.
Inert atmospheres, typically filled with noble gases, offer protection against chemical reactions but still necessitate careful selection of thermocouple materials for accurate temperature measurement.

Discover the optimal thermocouple solutions for your specific environment, enhancing performance and safety in high-temperature applications.

High temperature thermocouples are indispensable tools across various industries and sectors such as:

Aerospace
Semiconductor processing and equipment
Universities and research facilities
Pyrometallurgy
Vacuum furnaces
Incineration kilns
Glass and ceramic manufacturing
Heat treatment (furnaces)

There are situations where thermocouples have to withstand a combination of environments. We are happy to help with specific advice for your unique process and environment. Get in contact.