Conrad Kacsik Blog

AMS2750F Now Permits Type M and Type C Thermocouples

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 the director of technical services at Conrad Kacsik Instrument Systems, Inc. As a metallurgical engineer with 20-plus years in aerospace, he assists potential and existing Nadcap suppliers in conformance as well as metallurgical consulting. He is contracted by PRI Training as a Lead Instructor to teach multiple PRI courses, including pyrometry, RCCA and Checklists Review for heat treat. Jason is also a voting member on two AMEC committees. Contact him at