CMV Steck GmbH

Als offizielle Vertretung der Firma Aoip

präsentieren wir Ihnen eine Übersicht der Luftfahrtnorm AMS 2750

und der Messinstrumente die der Norm entsprechen

CMV Steck GmbHHebelstrasse 10D-75223 Niefern

Tel.:+49 (0) 7233 9596 10Fax:+49 (0) 7233 9596 50Mail: info@cmv-steck.deWeb: www.cmv-steck.de

Folgende Angaben der Firma Aoip werden von uns an Sie weitergeleitet

AOIP offer for AMS 2750 standardHow strict heat treatment of metal parts brings in

BUSINESS to AOIP

� AMS 2750 profile: US standard for heat treatment� AMS 2750 requirements:

– Use of furnaces and sensors

– Use of calibration instruments– Test and control means

� AOIP offer:– CALYS 150 and PHP 601 / SHP 601

– DATALOG / SA 32 and TC 6621

� Appendixes:– Appendix I: NADCAP overview– Appendix II: Periodicity of TUS required by AMS 2750– Appendix III: Periodicity of SAT required by AMS 2750– Appendix IV: Level of instrumentation defined by AMS 2750– Appendix V: Authorized calibration instruments

AMS 2750 profile: US standard for heat treatment

� Origin: US standard for heat treatment, included in the NADCAP*

� Current version: AMS 2750 – D, since September 2005

� Field of application:

AMS 2750 applies to all manufacturers and sub-contractors working for the aircraft industry

� Large target: All companies using parts that need to be heat treated (mainly metal parts)

� The standard defines the way heat treatment must be performed and more precisely:

– The use of furnaces, sensors and other instruments:

� Different furnace classes

� Different types of authorized sensors

� Different levels of instrumentation (number of sensors)

� Different types of calibration instruments

– The test and control means:

� Two regular and frequent obligatory tests:

SAT - System Accuracy Test / TUS - Temperature Uniformity Survey

� The frequency of SAT and TUS is defined according to the furnace class and the level of instrumentation

* See Appendix I: NADCAP overview

AMS 2750 requirements: Use of furnaces and sensors

According to AMS 2750 requirements, thermocouples must be calibrated before first use, then every three or six months.Considering the high recalibration frequency required, companies concerned by AMS 2750 must have their own calibration equipment and / or appoint service companies.

� 6 different furnaces classes based on the minimum requirements for temperature uniformity � Authorized sensors: Thermocouples (Beyond 80°C, Pt100 are not suitable for heat treating )

(Appendix III: Sensor calibration required by AMS 2750)

� 5 levels of instrumentation determine the number of controls performed on the furnace:(Appendix IV: Levels of instrumentation defined by AMS 2750)

– LOAD control: Temperature sensor placed on the surface of the part being heat treated– MIN/MAX temperature control: Sensors placed at the upper / lower temperature area– SAFETY: One SAFETY sensor at the upper temperature point of each area, to prevent

from overheating– REGULATION: One REGULATION sensor for each area– RECORDING: Recorder or acquisition system to save data from REGULATION sensors

Objective: Guarantee thermocouples are always in good working order and deliver correct values with accuracy below the maximum permitted error.

Method: Determine the frequency of calibration, the instrument used for the calibration and the maximum permitted error according to the type of thermocouple used and the use.

AMS 2750 requirements: Use of calibration instruments

� Authorized instruments: (Table available on Appendix V: Authorized calibration instruments)Objective: Define the suitable instruments implied in the process of heat treatment and theirminimum required calibration accuracy.

� AOIP program covers two types of instruments authori zed by AMS 2750:

CALYS 150

SAT/TUS:PHP601 + SHP101

Limited to laboratory calibration of field test instruments, SAT sensors, TUS sensors, load sensors, and controlling, monitoring, or recording sensors

±0.2 °C or ±0.05% of reading, whichever is greater

Primary standard or primary standard cell

12 months

Potentiometer, digital voltmeter

Secondary standard instrument

Limited to controlling, monitoring, or recordinginstrument calibration, performance of system accuracy tests, and temperature uniformity surveys

Use

±0.6 °C or ±0.1% of reading (°F), whichever is greater

Calibration accuracy

TUS:DATALOG / SA32

SAT: TC6621

AOIP instrument

Primary or secondarystandard

3 months

SAT/TUS Portable potentiometer or digital instrument, electronic data recorder, or data acquisition system

Field test instrument

StandardMAX. calibration period

Instrument typeInstrument

No consideration of CJC in AMS 2750: calculation of calibration accuracy is made without CJC.The standard has been published by an American Institute, and thus with the 0°C reference.

These instruments shall be calibrated by NIST or an equivalentnational standard organization, or against standards whose calibration is traceable to NIST or other recognized national equivalent

Calibration of AOIP instruments fully complies with AMS 2750

AMS 2750 requirements: Test and control means

� Two type of tests performed on furnaces:

SAT: System Accuracy Test

Objective:

Control and certification of the accuracy of data acquisition and control of the system over time

Method:

- Comparison in situ of data recorded with data read on the calibration instrument in order to define temperature gradients and check if they are acceptable

= Localized test of accuracy

TUS: Temperature Uniformity Survey

Objective:

Determine the work zone of a furnace

Method:

- Measure the furnace temperature variation with individually monitored thermocouples inside the furnace before and after temperature stabilization

- Compare the result with the authorized deviation from setpoint

- Apply the test standards set in AMS 2750 for calibration frequency and accuracy

= Acquisition of temperature from different sensors over a certain period of time

� The periodicity of SAT and TUS is clearly defined according to the furnace class and the level of instrumentation (Detailed information on Appendix II)

According to AMS 2750 requirements, SAT / TUS must be performed up to once per week .

AOIP offer: CALYS 150 and PHP 601 / SHP 601

� The standard sets following:The calibration of field test instruments, SAT / TUS sensors, load sensors, and controlling, monitoring, or recording sensors shall be performed by a secondary standard instrument with a minimum accuracy of: ± 0.2°C or ± 0.05% of reading, whichever is greater.

� For calibration: Full compliance of CALYS 150� For sensor control: Full compliance of PHP 601 / SHP 601

For every thermocouple used and over the whole range of temperature,

--- CALYS 150 and PHP 601 / SHP 601 are better than A MS tolerance ---

No consideration of CJC in AMS 2750: calculation of calibration accuracy is made without CJC.The standard has been published by an American Institute, and thus with the 0°C reference.

AMS toleranceAccuracy (°C)

Input measurement (°C)

0.2

0.1

0

0.3

0.4

0.5

0.6

1400600 1000200 400 800 1200 1600

0.2°C

0.05%0.05%

AMS toleranceAMS tolerance

Accuracy required by AMS 2750Accuracy required Accuracy required by by AMS 2750AMS 2750

CALYS 150 CALYS 150 uncertaintiesuncertainties

PHP / SHP PHP / SHP uncertaintiesuncertainties

AOIP offer: DATALOG / SA 32 and TC 6621

� The standard sets following:The calibration of monitoring, or recording instruments, and the control of SAT / TUS performance shall be performed by a field test instrument with a minimum accuracy of: ± 0.6°C or ± 0.1% of reading in °F, whichever is greater.

� For TUS: Full compliance of DATALOG / SA 32For SAT: Full compliance of TC 6621

Over the whole range of temperature,

--- DATALOG / SA 32 and TC 6621 uncertainties are bet ter than AMS tolerance ---

No consideration of CJC in AMS 2750: calculation of calibration accuracy is made without CJC.The standard has been published by an American Institute, and thus with the 0°C reference.

AMS tolerance

Accuracy (°C)

Input measurement (°C)

0.4

0.2

0

0.6

0.8

1400600 1000200 400 800 1200 1600

0.6°C0.1% in °F0.1% in °F

AMS tolerance

Accepted accuracyAccepted accuracyAccepted accuracy

TC 6621 TC 6621 uncertaintiesuncertainties

DATALOG / SA 32 DATALOG / SA 32 uncertaintiesuncertainties

Appendix I: NADCAP overview

� NADCAP: National Aerospace & Defence Contractors Accreditation Program

� Objective:

– Improve quality and reduce costs in the aerospace and defense industries through standardized approach to quality assurance and reduction in repeated auditing

� Practises concerned by NADCAP:

� NADCAP members:

Bombardier, Boeing, EADS, Goodrich Corp., Honeywell Aerospace, Liebherr-Aerospace SAS, Safran Group, Thales…

– Chemical processing

– Coatings

– Composites

– Elastomer seals

– Electronics

– Fluid Distribution systems

– Heat treating

– Materials testing laboratory

– Non conventional machining & surface enhancement

– Non destructive testing

– Sealants

– Welding

AMS 2750

Appendix II: Periodicity of TUS required by AMS 2750

� Temperature Uniformity Survey

1 / year

1 / year

2 / year

2 / year

1 / year

2 / year

2 / year

1 / year

2 / year

2 / year

2 / year

1 / quarter

1 / two months

2 / year

1 / quarter

1 / two months

Reduced TUS frequency

1 / year

1 / quarter

1 / quarter

1 / quarter

1 / month

1 / month

Initial TUS frequency

Not relevant

2

3

4

2

3

4

2

3

4

2

4

8

2

4

8

Number of consecutive successful TUS

E

A

B, C

D

A

B, C

D

A

B, C

D

A

B, C

D

A

B, C

D

Minimum type of instrumentation

± 104

± 31

± 28

± 14

± 8

± 6

Temperature uniformity range (°C)

3

5

6

2

Furnaceclass

Appendix II: Periodicity of SAT required by AMS 2750

2 / year

1 / quarter

1 / quarter

2 / year

1 / quarter

1 / quarter

1 / month

1 / month

1 / two weeks

E

A

B, C

D

A

B, C

D

A

B, C

D

A

B, C

D

A

B, C

D

Minimum type of instrumentation

Furnaces for raw materialsAll furnaces except those for raw materials

2 / year

1 / month

1 / month

1 / month

1 / week

1 / week

MIN. SAT frequency

2 / year

1 / quarter

1 / quarter

1 / month

1 / quarter

1 / quarter

1 / month

1 / month

1 / month

1 / week

1 / month

1 / month

1 / week

1 / month

1 / month

1 / week

Normal SAT frequency

2 / year

1 / quarter

1 / month

1 / two weeks

1 / quarter

1 / month

1 / two weeks

1 / quarter

1 / month

1 / two weeks

1 / month

1 / two weeks

1 / week

1 / two weeks

1 / week

1 / week

Normal SAT frequency

2 / year

2 / year

2 / year

1 / quarter

1 / quarter

1 / quarter

± 104

1 / quarter

1 / quarter

1 / month

± 31

1 / quarter

± 28

± 14

± 8

± 6

Temperature uniformity range (°C)

1 / month

3

1 / quarter

2 / year5

1 / quarter

2 / year6

1 / month

2

MIN. SAT frequency

Furnaceclass

� System Accuracy Test

Appendix III: Sensor calibration required by AMS 2750

Load sensing

Installation in

equipment

SAT

TUS

UseMaximum permitted error

(°C) (2) (3)

Calibration (4)

Primary or secondary standar

Primary or secondarystandard

Primary or secondarystandard

Primary or secondarystandard

Against

Before first useRecalibration:6 months – Types B / R / SNot permitted – base metal

Before first use

Before first useRecalibration:6 months – Types B / R / S3 months – Types J / NNot permitted – other base metal

Before first useRecalibration:6 months – Types B / R / S3 months – Types J / NNot permitted – other base metal

Period

Base metal: ± 1.1 or ±0.4%Noble metal: ± 0.6 or±0.1% Type R / Sor 0.25% Type B

Base or type B / R / S noble metalSystem

Accuracy Test

Base or type B / R / S noble metal

Base or type B / R / S noble metal

Base or type B / R / S noble metal

Sensor type(1) (3)

± 2.2 or 0.75%Temperature Uniformity Survey

Control, recording, andmonitoring

Class 1 / 2: ± 1.1 or ±0.4%Class 3 / 4 / 5 / 6: ±2.2 or 0.75%

± 2.2 or ± 0.75%Load

Sensor

(1) Temperature sensors that possess equal or better accuracy (maximum permitted error) are acceptable.

(2) Percent of reading or correction factor in degrees, whichever is greater

(3) Type T thermocouples are normally used below 0°C with a tolerance of ± 0.6°C or ± 0.8%, whichever is gr eater.

(4) A reference standard sensor may be used to calibrate any lower level sensor.

Appendix IV: Level of instrumentation defined by AMS 2750

x

x

x

x

1 safety TC

x

x

At least one load TC per area

x

x

1 TC at MIN / MAX temperature area from last TUS

xxD level: 2 sensors

xxC level: 4 sensors

xE level: 1 sensor

xxB level: 3 sensors

xxA level: 5 sensors

Recording of the regulation TC

1 regulation TCper area

Thermocouples required per area:

Water

Metal part

DAQ

Safety

Regulation

Load

Limited to laboratory standardization of secondary standard instruments and calibration of test instruments

±0.005% of millivoltage rating of cell

Primary standard cell

12 months

2 or more saturated or unsaturated Weston-type cells or equivalent solid state DC standards

Secondary standard cell

Limited to laboratory calibration of field test instruments, SAT sensors, TUS sensors, load sensors, and controlling, monitoring, or recording sensors

±0.2 °C or ±0.05% of reading, whichever is greater

Primary standard or primary standard cell

12 monthsPotentiometer, digital voltmeter

Secondary standard instrument

Limited to laboratory calibration of instruments and secondarystandard cells and standardizationof instruments

±0.005% of millivoltage rating of cell

Referencestandard

12 months4 or more Weston-type cells or equivalent solidstate DC standards

PrimaryStandard

Limited to laboratory calibration of secondary standard and test instruments, primary & secondarystandard sensors

Limited to primary standard calibration

Use

±.05 °C or ±0.015% of reading, whichever is greater

Per NIST

Calibration accuracy

Referencestandard

36 monthsPotentiometer, digital voltmeter

NIST36 monthsZener voltage referenceReferencestandard

StandardMAX. calibration period

Instrument typeInstrument

Appendix V: Authorized calibration instruments

Limited to measuring temperatureof refrigeration and quench bath thermal processing equipment

±3 °CComparative test (sameas for SAT)

6 monthsMechanical or thermal element

Controlling, monitoring, or recordinginstrument

Limited to measuring, recording, and controlling temperature of thermal processing equipment

±1.1 °C or ±0.3% of the MAX survey temperature of the equipment, whichever is greater

TestElectromechanicalinstrument

Limited to measuring, recording, and controlling temperature of thermal processing equipment

±1.1 °CTestDigital instrument

Limited to controlling, monitoring, or recording instrument calibration, performance of system accuracytests, and temperature uniformity surveys

Use

±0.6 °C or ±0.1% of reading in °F, whichever is greater

Calibration accuracy

Primary or secondarystandard

3 months

SAT/TUS Portable potentiometer or digital instrument, electronicdata recorder, or data acquisition system

Field test instrument

StandardMAX. calibration period

Instrument typeInstrument

Appendix V: Authorized calibration instruments