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AMS2750, AMS2770, NADCAP, BAC5621, RPS953,
ATEX (Explosive Atmospheres), UL, GOST, etc.

For the aviation industry, the AMS 2750 standards and their AMS 2770 derivatives (Aerospace Material Specifications) are applicable to industrial treatment of top-quality materials and heat treatment of aluminium alloys.

For the automobile industry, the CQI-9 standard also aims to subject heat treatment processes to stricter rules.

Heat treatment installations must guarantee the following:

  • Temperature uniformity in the working space (TUS)
  • Instrumentation (definition of the measuring and control equipment)
  • Calibration of the measurement path (IT) between the controller and the thermocouple, including the measurement line
  • System accuracy tests (SAT)

Documentation of test cycles:

Compliance with provisions and standards is essential to guarantee the level of quality which the components must meet, even if they are mass-produced. That is why it is necessary to carry out extensive and repeated tests, including testing of the instruments, and to draw up documentation.

Under the requirements of the AMS 2750 standard, the customer must also specify

  • The furnace class (temperature uniformity class)
  • The type of instrumentation (control instruments, means of recording and thermocouples used).

The more demanding the furnace class, the more accurate the instruments must be.




uniformity TUS – Temperature Uniformity Surveys

Maximum difference

in SAT – System Accuracy Test

°C °C % of reading
1 ± 3 ± 1,1 0,2
2 ± 6 ± 1,7 0,3
3 ± 8 ± 2,2 0,4
4 ± 10 ± 2,2 0,4


Type of instrumentation
Required for each zone TC name TC connected to A B C D E
At least 1 sensor connected to 1 controller Control TC Régulateur programmateur X X X X X
Recording of control sensor Control TC Recorder X X X X
Recording of control sensor Hot TC Recorder X X
Recording of Cold point Cold TC Recorder X X
Recording of load sensor Load TC Recorder X X
Overheating protection Safety TC

or Hot TC

Safety controller X X X X


Regular tests:

The standard defines the intervals for testing of the instruments

System Accuracy Test (SAT) and furnace temperature uniformity test (TUS = Temperature Uniformity Survey).

The SAT/TUS tests must be carried out by the customer with measuring devices and sensors which operate independently from the furnace’s instruments.