This specification covers pyrometric requirements for equipment used for the thermal processing of metallic materials. Specifically, it covers temperature sensors, instrumentation, thermal processing equipment, correction factors and instrument offsets, system accuracy tests, and temperature uniformity surveys. These are necessary to ensure that parts or raw materials are heat treated in accordance with the applicable specification(s).
Rationale
AMS2750F results from a Five-Year Review and update of the specification. Technical changes have been made that resolve issues that were found in the previous revision. Resolution requirements for recording instruments have been updated to be able to demonstrate that the equipment meets the accuracy tolerances of Table 7 when using the percentage instead of the numerical tolerance.
AMS2750F is a complete rewrite. Therefore, there are no change bars to indicate specific changes from the last revision.
The use of Fahrenheit versus Celsius temperatures and Imperial versus SI measurement units has been changed from °F (°C) to °F or °C and Imperial units (SI units) to Imperial units or SI units to reflect the requirements for users working to Fahrenheit/Imperial units and the requirements for users working to Celsius/SI units.
NOTE: Some requirements are precise conversions while others are approximate conversions (see 8.2).
Non-expendable base metal load sensor use temperature, interval or uses
Unnamed Dataset 10
Table 7
Instruments and instrument calibration
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Unnamed Dataset 13
Table 8
Recording instrument resolution requirements
Table 9
Recording instrument print interval and chart speed requirements
Table 10
Classification of analog and digital recording instruments
Table 11
Furnace class uniformity tolerances
Table 12
Instrumentation type requirements
Table 13
Minimum sensors required per control zone
Table 14
Parts furnace class, instrument type and SAT interval
Table 15
Raw material furnace class, instrument type and SAT interval
Table 16
Allowable combinations of resident SAT sensor and sensor being tested for temperatures greater than 500 °F or 260 °C
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Table 17
SAT waiver relationship
Table 18
Parts furnace class, instrument type, and TUS interval
Table 19
Raw material furnace class, instrument type, and TUS interval
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Unnamed Dataset 28
Table 20
Minimum number of TUS sensors and required locations
Table 21
Number of TUS sensors required for batch furnaces, salt baths, controlled temperature liquid baths, fluidized bed furnaces, or continuous furnaces surveyed using the volumetric method
Unnamed Dataset 31
Table 22
Number and location of TUS sensors for continuous and semi-continuous furnaces when using the plane method
Table 23
Allowable number of TUS sensor failures for TUSs performed <2000 °F or <1093 °C
Table 24
Allowable number of TUS sensor failures for TUSs performed ≥2000 °F or ≥1093 °C
The committee of Finishes, Processes, and Fluids, AMS Committee B, shall prepare, coordinate, and revise documents related to processing technology, such as plating, brazing, coatings and compounds, through the participation of process suppliers, users, and interested government agencies. Committee activities shall provide a forum for the cooperative interchange of ideas and experience of the participants, resulting in the publication of specifications that embody sound, established aerospace industry practices and requirements to serve the suppliers and customers of aerospace processes.
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Pyrometry
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