AMS 2750 E PDF Download: Calibration and Reporting Solutions for Heat Treatment Processes

// The AMS2750E is predominantly designed for heat treatment in the aerospace industries. 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.

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The AMS2750 standard was initially developed to provide consistent specifications for heat treatment through the aerospace supply chain. The use of the standard is audited by PRI (Performance Review Institute) for the Nadcap (National Aerospace and Defense Contractors Accreditation Program). Prior to Nadcap, aerospace companies each audited their own suppliers, so there was a lot of redundancy and duplication of efforts. In 1990, the PRI was established to administer the Nadcap program.

The AMS2750E is predominantly designed for the aerospace industries. But the same standards and processing techniques can be used within any industry which requires control of the thermal processing of raw materials and manufactured components, such as automotive, rail and manufacturing.

In the Table 3 in the AMS2750E standard, there are different specifications for the test standards and test equipment/calibrators. The different levels of instruments are classified as follows:

AMS2750E also specifies the calibration period and accuracy requirements for the different levels of instruments, below is what is said about the secondary standard instrument and field test instrument:

We had a Questions & Answers session with Mr. Julian Disse (Team Coordinator Quality Assurance Special Standards) at Deutsche Edelstahlwerke and discussed on the challenges on following the AMS2750 standard, audits, measurements, calibrations, sensors, traceability and other things.

Here's an example case story of company Trescal, UK. They are a calibration service provider for aerospace customers and need to follow the AMS2750 standard. Trescal have found Beamex calibrators (MC2, MC5 and MC6) as a good fit for the work they do. Click the link below to read the case Trescal story:

Beamex offers various temperature calibration products that can be used (and are being used) in an AMS2750E environment. You can find the detailed information of our offering on our website in the below link:

2 Overview on Changes AMS2750 Specification Updated to Revision E - New Revision of Spec 2750E revised July 2012; - Replaces Spec D (revised Sept 2005) - Updated to include wireless sensor technology - Added requirements to document As found instrument calibration and offset conditions (procedural impacts) - Calibration changes like check min. of 6 simulated min. 4 points, calibrated for each type input/output used - Provides more details on Temperature Uniformity Survey Testing (TUS) procedures, furnace repairs and modifications, data collection requirements, survey frequency, number and location of sensors, Pass/Fail requirements - Added Refrigeration & Quench Furnace class to tables General Update 2 HONEYWELL - CONFIDENTIAL File Number

3 Standards AMS2750E Pyrometry - Covers Temperature Sensor, Instrumentation, Thermal processing equipment, System Accuracy Tests, Temperature Uniformity Survey requirements - Ensures that parts or raw material are heat treated in accordance to applicable specifications AS7102 Nadcap Requirements for Heat Treating - Documents the requirements for the accreditation program - Industry managed program for continuous improvement Standard industry audit program for special processes Focuses on overall supplier performance Auditing overseen by PRI (Performance Review Institute) 3 HONEYWELL - CONFIDENTIAL File Number

4 AMS 2750E Section 2 Definitions Changes - Par DIGITAL INSTRUMENT: Clarification was added to definition of digital instruments with digital temperature display and with temperature trace on paper chart: An instrument that presents process measurements in a digital (numeric) display format. Typical examples are mechanical recorders with digital displays, digital indicators, controllers with digital displays, etc. In the case of a recorder with digital temperature display and a recorder trace (line) the record (recorder trace) is analog while the display is digital. A recorder trace on a paper chart is an analog record. - Par INTERVAL Interval definition was added to AMS2750E to avoid confusion by some suppliers. 4 HONEYWELL - CONFIDENTIAL File Number

5 AMS 2750E Section 2 Definitions Changes - Par LOAD SENSORS : Clarification regarding correct usage of load sensors/ thermocouples. (in rev. D it was not included in the load sensor definition but stated in par ): Sensors that are attached to or in contact with production material, a representation of production material, or are buried in the load of production material and which supply temperature data of the production material to process instrumentation. 5 HONEYWELL - CONFIDENTIAL File Number

6 AMS 2750E Temp Sensor Changes Temperature Sensor - Section 3.1 Changes - This section deals with the requirements for the temperature sensors used in these heat treatment processes AMS2750E Section Reference AMS2750E Change Allows use of Wireless transmitters as alternative to New extension wire Certs for sensors now require Date of Calibration New Comment Correction factor for each calibration temperature traceable to NIST or other recognized National Standard. Alternatively, deviation (error) for each calibration temperature may be listed. The certificate shall clearly state if it shows deviation or correction factor Extrapolation of calibration correction factors above the highest calibration temperature and below the lowest calibration temperature is prohibited by any calibration source except NIST or other National Standards calibration agency. Added this Added except NIST or other National Standards calibration agency. 6 HONEYWELL - CONFIDENTIAL File Number

7 AMS 2750E Temp Sensor Changes Temperature Sensor - Section 3.1 Changes AMS2750E Section AMS2750E Change Reference When calibrating thermocouples rolls, AMS2750 Rev. E requires sampling from both ends regardless of roll length. (1000 feet/305 meters limit from AMS2750D for one end sampling only is no longer acceptable). Other requirements for rolls calibration remains the same Nonexpendable base metal TUS TCs used below 1200F (650C) do not need to be permanently installed on TUS rack between its usage like it was stated in Rev. D Added time of 90 days Expendable base metal load sensors may be used for up to 90 calendar days after first use and for no more than 30 uses Changed the requirement on the life of nonexpendable base metal load thermocouples 2200 F (1205 C) to 2299 F (1260 C) 3 months or 10 uses 1801 F (980 C) to 2199 F (1205 C) 3 months or 90 uses Comment Added Rolls shall be sampled at both ends of the roll TUS T/C s can be reinserted for each TUS through ports in the furnace; need to be used at the same location and depth of insertion. Previously was just 30 uses Previously for 2200 F was just 10 uses, no time period specified 1801 F was 30 days or 90 uses; now 90 days or 90 uses 7 HONEYWELL - CONFIDENTIAL File Number

8 AMS 2750E Temp Sensor Changes Temperature Sensor - Section 3.1 Changes AMS2750E Section Reference Figure 1 Figure 1 AMS2750E Change Added Table of Reuse and Recalibration of Test & Load Sensors Sensor - Secondary Standard Max. Permitted Error changes Comment Summarizes Reuse & Recalibration Primarily for clarification Increased max. permitted error Figure 1 Sensor System Accuracy Test Max. Permitted Error changes Recalibration permited if Types E & K are used below 500F (260C) only (Note 11) Type B TCs are allowed as resident SAT TCs for temperatures above 500F (260C) Increased max. permitted error Type B T/C s were not allowed by Rev D. 8 HONEYWELL - CONFIDENTIAL File Number

9 AMS 2750E Instruments Controlling, Monitoring or Recording Instruments Instrumentation - Section 3.2 Changes - This section deals with the requirements of the instrumentation used in these heat treatment processes AMS2750E Section AMS2750E Change Reference AMS2750D allowed to use instruments meeting requirements of AMS2750C (but not meeting rev D requirements) if these instruments were purchased before September 2006 (one year after rev. D issue). If you have such instruments, now you have 3 years you upgrade your equipment to meet Rev. E requirements Temperature resolution requirements for chart recorders shall be in accordance with Table 4. (See next slide for table) Comment Exemption will run out for older instrumentation, now have to upgrade within 3 years of issuing of AMS2750E (issued July 2012) New requirements for refrigeration & quench system recorders added Process Recorder Print and Chart Speeds shall be in accordance with Table 5. (See next slide for table) Added metric speeds and updated notes 9 HONEYWELL - CONFIDENTIAL File Number

10 AMS 2750E Instruments Controlling, Monitoring or Recording Instruments New - requriements for refrigeration and quench system recorders were not defined in rev D. 10 HONEYWELL - CONFIDENTIAL File Number

11 AMS 2750E Instruments Controlling, Monitoring or Recording Instruments Secondary Standard & Field Inst. Calibration Changes AMS2750E Section Reference AMS2750E Change Calibration of secondary standard instruments and field test instruments shall be performed in accordance with the manufacturer s instructions. These instruments shall be tested at a minimum of 6 simulated sensor inputs. These shall include the minimum and maximum of the operating range used for test or calibration and a minimum of 4 points in between either representing areas of normal operation or spaced at approximately equal intervals across the range in which the instrument is used for test or calibration The instrument shall be calibrated for each type of input and/or output used (e.g., each thermocouple type in use and for mv, ma, etc. if the instrument is used for these methods) Calibration shall be performed on each channel in use that can be altered or adjusted individually, or on each group of channels that can be altered or adjusted as a group. It is recommended that channels not in use be blocked or tagged to stop unintentional use. Comment New requirements regarding secondary standard instruments and field instruments calibration New requirements regarding secondary standard instruments and field instruments calibration New requirements regarding secondary standard instruments and field instruments calibration 11 HONEYWELL - CONFIDENTIAL File Number 2ff7e9595c