Conrad Kacsik Blog

AMS2750F Thermocouple Requirements

Jul 22, 2020 2:49:45 PM / by Jason Schulze

Thermocouple-WireOur goal is to keep our clients up to date on the new changes to AMS2750. In today’s blog post, I’m discussing how AMS2750F now permits Type M and Type C thermocouples. It is important to understand the use and limitations of thermocouples prior to use.

The chemical composition of Type M thermocouples is Type M 82%Ni, 18%Mo, 99.2%Ni, 0.8%Co, by weight. When compared with the chemical composition of Type K thermocouples (90% nickel, 10% chromium - 95% nickel, 5% aluminum and silicon), it is clear that they are able to share the same extensions wire.

Type C thermocouple composition is 95%W, 5%Re–74%W, 26%Re, by weight and is designed for high temperatures (2328 degrees Celsius).

To learn more about the design, composition and use of thermocouples, attend an upcoming AMS2750 training course, Principles of Pyrometry.

If you are interested in better understanding all the changes within AMS2750F, obtain conformance tools and learn how to implement successfully, join us July 30, 2020 for a 2-hour virtual training.


Topics: Nadcap, AMS2750, Pyrometry

Jason Schulze

Written by Jason Schulze

Jason Schulze is a metallurgical engineer at Conrad Kacsik with over 20 years experience in the aerospace industry. He has been exposed to Nadcap in multiple commodities, although he often focuses on heat treat. Jason works with companies to insource and improve metallurgical processes, perform gap analysis and internal audits as well as gain Nadcap approval. He is a voting member of the Aerospace Metals and Engineering Committee (AMEC) B & D which provides the aerospace industry with the technical benefits that accrue from the ideas and experience of its members. Additionally, Jason is contracted by PRI as a PRI Training (formerly eQuaLearn) Instructor and teaches multiple courses, including pyrometry. He also writes articles for Heat Treat Today and Thermal Processing on specific subjects related to Nadcap heat treat audits and pyrometry.

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