Outlining Kapton-Insulated Thermocouple Wire

When insulating electrical wires in temperature-critical applications Kapton is one of the first choice materials. It can be easily incorporated into traditional wiring designs where single or multi-strand conductors – usually copper – are enclosed within a protective insulating sheath.

In this instance, the insulator is a patented polyimide with links to aeronautics and space exploration, demonstrating extraordinary thermodynamic stability in combination with superior dielectric performance in vacuum conditions.

At Allectra, Kapton-insulated wires are developed in a diverse range of configurations and formats. Besides conventional types for traditional signal transmission, Allectra can provide coaxial cables and flexible ribbon harnesses for the low-loss signal transmission in high-vacuum and ultra-high vacuum (HV/UHV) environments. Allectra’s precision-based Kapton-insulated wire products also accommodate a selection of Kapton thermocouples for temperature-critical vacuum processes.

What are Thermocouples?

A thermocouple is a type of temperature sensor based on a cable made up of two different metallic conductors, which are fused together at one end to create a junction. This junction is exposed to the sensing environment. Thereafter, readings from inside the chamber are transmitted to an external indicator via a hermetically-sealed feedthrough; this allows for continuous, real-time monitoring of in-vacuum temperatures.

Outlining Kapton-Insulated Thermocouple Wire

Image Credit: Allectra Limited

Thermocouples do not directly read temperature. Instead, they calculate process temperatures as a function of charge separation, or electromotive force (EMF) via state-of-the-art software; this is largely dependent upon material combinations. Type K thermocouples are composed of Chromel (90% nickel and 10% chromium alloy) and Alumel (95% nickel, 2% aluminum, 2% manganese and 1% silicon alloy) wires and are among the most commonplace of thermocouple wire pairs.

Type K and Type N Kapton Thermocouples

The alumel-chromel (type K) pairing is widely accepted for various reasons: it is reliable and accurate across a wide range of temperatures and is comparatively inexpensive. Subsequently, type K thermocouples are utilized in a choice of harsh working environments, allowing temperature measurements from -200 °C up to +1250 °C.

Type K thermocouples are well-suited to an array of feedthroughs and measuring instruments, with excellent performance across a large temperature range, they are optimal for temperature sensing in various sectors ranging from research in alternative energy solutions to pioneering surface science.

Type N thermocouple wires provide great stability over time with temperature range measurements from -250 °C up to 1300 °C max.

Allectra supplies Kapton-insulated Type K & N thermocouples for temperature-critical vacuum processing. Note, that Kapton can resist and endure a maximum temperature of +300 °C. Allectra now offers new 301-Type K & N Kapton-insulated thermocouple wires that are UHV compatible as well as radiation hard/resistant.

Kapton is a registered trademark of DuPont.

This information has been sourced, reviewed and adapted from materials provided by Allectra Limited.

For more information on this source, please visit Allectra Limited.


Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Allectra Limited. (2020, October 21). Outlining Kapton-Insulated Thermocouple Wire. AZoM. Retrieved on December 02, 2020 from https://www.azom.com/article.aspx?ArticleID=19738.

  • MLA

    Allectra Limited. "Outlining Kapton-Insulated Thermocouple Wire". AZoM. 02 December 2020. <https://www.azom.com/article.aspx?ArticleID=19738>.

  • Chicago

    Allectra Limited. "Outlining Kapton-Insulated Thermocouple Wire". AZoM. https://www.azom.com/article.aspx?ArticleID=19738. (accessed December 02, 2020).

  • Harvard

    Allectra Limited. 2020. Outlining Kapton-Insulated Thermocouple Wire. AZoM, viewed 02 December 2020, https://www.azom.com/article.aspx?ArticleID=19738.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback