Heat treatment is an essential process for many critical parts of an airplane, so it is understandable that there are tight regulations and audit processes set. While the results and success of some other industrial processes can be relatively easily measured after the process, this is not the case in a heat treatment process. Therefore, very tight control and documentation of the heat treatment process is essential to assure the quality of the end products. Followed by revisions: revision A in , B also in , C in and D in The AMS standard was initially developed to provide consistent specifications for heat treatment through the aerospace supply chain. Prior to Nadcap, aerospace companies each audited their own suppliers, so there was a lot of redundancy and duplication of efforts.
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Practical Considerations In Clause 3. Instruments shall be calibrated by NIST or an equivalent national standard, or against standards whose calibration is traceable to NIST or other recognised national equivalent s according to Table 3. AMS D Section 3. As discussed above the purpose of the system accuracy test for instrumentation is to determine the difference between the instrument under test and the accredited calibration test instrument such that a complete chain of traceability can be formed between the instrument under test and NIST or equivalent national standard.
The importance is to determine that the observable difference, between any two layers of traceability is within tolerances determined in AMSD. This ensures that observable accuracy takes account of all possible components of instrument error including input accuracy, sensor linearisation, cold junction compensation and drift. As part of the reporting procedures for SATs defined in 3.
Two typical quoted levels of accuracy for Eurotherm instruments are identified below but this does not define their suitability or unsuitability to meet SATs. Many Eurotherm products provide password protected offsets, which can be applied to remove simple single point errors within the allowable level defined in table 6 and 7. Care must be taken when applying instrumentation particularly to Class 1 and Class 2 furnaces and when choosing instruments for use in any specific application so that instruments can be configured to accommodate the desired range of use with the required decimal point resolution.
The range of use, which allows observable calibration error to decimal point resolution may restrict instrument use to Furnace Class Temperature Uniformity Table 6 and 7 further define the allowable level of temperature uniformity allowable for each furnace class. To achieve the level of uniformity tolerance required for this class of furnace across the furnace volume and across the desired setpoint range will invariably require a controller which aids not only SAT compliance but control uniformity stability and overshoot elimination.
It can be seen from this that choosing a controller for use on a class 1 furnace needs careful consideration not only on the ability to meet SAT but the demands for overall furnace performance.
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