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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:
[email protected]: www.cmv-steck.de
Folgende Angaben der Firma Aoip werden von uns an Sie
weitergeleitet
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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
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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
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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.
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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
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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 .
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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
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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
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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
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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
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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
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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.
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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
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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
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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