In the new revision of AMS2750F, standard error limit requirements have been removed from Table 1. The error of ±4°F or ±0.75% is no longer permitted.
AMS2750F has added specific items that must be present on thermocouple certifications. These include, but are not limited to:
AMS2750F now addresses the assembly of the hot junction portion of thermocouples. It states that hot junctions may be made by twisting and/or welding or a combination of those, although no addition of filler metal may be used.
AMS2750F now presents a different definition of expendable versus nonexpendable thermocouples. As a thermocouple supplier, we feel it is important to keep our clients informed as to the details of these changes.
Our 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.
When AMS2750 went from revision D to revision E, one of the changes was that ASTM E29 was required for rounding significant digits. Rounding using ASTM E29 is not your old spreadsheet version of rounding—more discretion is required.
AMS2750F now states that third party pyrometry service providers must have a quality system that is ISO/IEC 17025 accredited from an ILAC (International Laboratory Accreditation Corporation) recognized regional cooperation body by June 2022. This accreditation will apply to the laboratory standards and/or field service as applicable.
AMS2750F has arrived. With the industry having a limited amount of time to implement
the changes in full, Conrad Kacsik is working hard to keep our customers informed. Our
customers have depended on Conrad Kacsik to be their technical guide throughout the many changes AMS2750 has gone through and we are proud to be doing it again.
Pyrometry procedures that comply with AMS2750E and/or Nadcap requirements can be complex and challenging to meet. I often perform gap analyses on heat-treat processes and uncover issues with procedures and work instructions that, if not remedied, will ensure failure when it comes to meeting Nadcap or AMS2750E requirements.
As a specialist in process controls, my company offers comprehensive temperature uniformity surveys. Through years of training operators and helping companies work on temperature uniformity survey procedures, I have found one of the sticking points in meeting compliance standards involves thermocouples.