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REVISION HISTORY
LTR DATE REVISED BY APPROVED BY PAGES AFFECTED

NC 2001-02-12 D. Rivest B. Thomas All

A 2001-05-08 D. Rivest B. Thomas All
B PR3 2009-08-31 A. Bourgeois D. Rivest 4, 5, 7, 8, 9, 10, 12, 13, 14,
15, 17, 18, 19, 21
Comments: 1. Corrected improper references to Sections on p. 12, 13, 14, 15 & 18
2. Added acceptability of bodies recognized by NIST on p. 7, 8 & 10
3. Added “recorder resolution” to Table 1
4. Revised Table 2 title to “equipment”
5. Added issue clause to Section 2 and issue level of AMS 2750
6. Revised requirements for heat treatment of metals on p. 9, 12, 13, 14 & 22
7. Added note 14 to TUS & SAT in Table 4
8. Added note 15 to working instruments in Table 4
9. Modified acceptance criteria in Table 4 p.18 & 19
10. Deleted Section 10
11. Corrected various errors in conversion from degree F to degree C (chande bars
omitted)
DISPOSITION OF STOCK:

MATERIALS: Use
PARTS PROCESSED: Use as is
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TABLE OF CONTENTS
1 SCOPE.................................................................................................................... 4
1.1 CLASSIFICATION ......................................................................................... 4
2 APPLICABLE DOCUMENTS ................................................................................. 5
3 DEFINITIONS ......................................................................................................... 6
4 FACILITIES............................................................................................................. 7
4.1 INSTRUMENTATION REQUIREMENTS FOR MATERIAL
PROCESSING EQUIPMENT ........................................................................ 7
4.1.1 General .............................................................................................. 7
4.2 REFRIGERATORS........................................................................................ 8
4.3 QUENCH BATHS .......................................................................................... 8
4.4 CHEMICAL PROCESSING EQUIPMENT ..................................................... 8
4.5 TEMPERATURE SENSORS ......................................................................... 8
4.5.1 Thermocouples .................................................................................. 9
4.5.2 Re-use of Thermocouples................................................................ 10
4.6 TEST INSTRUMENTS................................................................................. 10
5 MATERIALS ......................................................................................................... 11
5.1 AIRCRAFT AND PROCESS MATERIALS .................................................. 11
5.2 MISCELLANEOUS ...................................................................................... 11
6 HEALTH AND SAFETY........................................................................................ 11
7 REQUIREMENTS ................................................................................................. 12
8 TESTING PROCEDURE....................................................................................... 12
8.1 GENERAL ................................................................................................... 12
8.2 TEMPERATURE UNIFORMITY SURVEY................................................... 12
8.2.1 Equipment Conditioning................................................................... 12
8.2.2 Recording Data................................................................................ 13
8.2.3 Test Sensor Locations ..................................................................... 14

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TABLE OF CONTENTS
8.2.4 Qualification Temperature Uniformity Survey .................................. 14
8.3 INSTRUMENTATION SYSTEM ACCURACY CHECK ................................ 15
9 QUALITY CONTROL............................................................................................ 16
9.1 RECORDS................................................................................................... 16
9.2 QUALITY CONTROL REQUIREMENTS ..................................................... 17

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LIST OF FIGURES AND TABLES

TABLES
TABLE 1 PROCESS EQUIPMENT CLASSES............................................................ 4

TABLE 2 EQUIPMENT TYPES AND REQUIREMENTS............................................. 5

TABLE 3 SENSOR LOCATIONS FOR CHEMICAL PROCESSING TANKS [1] ...... 14

TABLE 4 QUALITY CONTROL AND ACCEPTANCE CRITERIA ............................. 17

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1 SCOPE
This specification establishes the requirements for control of thermal processing
equipment and instruments. This specification applies but is not limited to, heat
treating and hot forming equipment, autoclaves, cavity and platen presses,
refrigerators, chemical and electrochemical processing equipment, etc.
This specification also establishes procedures for temperature uniformity surveys,
system accuracy checks and system certification of thermal processing equipment.
This specification is based upon the Industry Standard Pyrometry AMS 2750.

1.1 CLASSIFICATION

Classes establish the allowable temperature variations within the equipment work
zone. The type establishes the requirements for the controlling instrumentation.
The equipment class and type required for processing material shall be as required
per the appropriate processing specification.
Equipment classes and types are defined in Tables 1 and 2 respectively.
TABLE 1 PROCESS EQUIPMENT CLASSES

Equipment Recorder Resolution

Equipment Temperature Maximum ºF per inch
Class Tolerance [1] of chart (ºC/cm)
ºF (ºC) [2]

5 ± 5 (2.8) 75 (16.4)
10 ± 10 (5.6) 150 (32.8)
15 ± 15 (8.3) 225 (49.2)
25 ± 25 (13.9) 250 (54.7)
50 ± 50 (27.8) 500 (109.4)

NOTES: [1] Equipment temperature tolerance is the maximum difference

between control set temperature and any point within the work
zone of the equipment.
[2] This requirement may be waived for solid state digital
instrumentation or electronic memory systems.
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TABLE 2 EQUIPMENT TYPES AND REQUIREMENTS

Type Instrumentation High Limit Location of Sensing

Instrument Element

A Independent or combination Indicating Controller: -Temperature

controller-recorder and one instrument mid-point.
independent recording
instrument Recorders: -As
determined by uniformity
survey [1].

B Independent or combination Indicating Temperature mid-point

controller-recorder instrument

C Indicating controller As req’d for Temperature mid-point

safety

D Non-indicating controller As req’d for Approximate mid-

safety temperature

E Recording, pyrometer or As req’d for Approximate mid-

thermometer safety temperature

NOTE: [1] The location of the recording sensors shall be representative of the
minimum and maximum working zone temperature as determined by a
temperature uniformity survey.

2 APPLICABLE DOCUMENTS
Except where a specific issue is indicated, the issue of the following documents in
effect at the time of manufacture shall form a part of this specification to the
extent indicated herein.
AMS 2750 Issue D Pyrometry
ASTM E 207 Thermal EMF Test of Single Thermoelement Materials by
Comparison with a Secondary Standard of Similar EMF-
Temperature Properties
ASTM E 220 Calibration of Thermocouples by Comparison Techniques.
ASTM E 230 Temperature-Electromotive Force (EMF) Tables for
Standardized Thermocouples.
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ISO 10012-1 Metrological Confirmation System for Measuring Equipment

3 DEFINITIONS
Accuracy - The maximum deviation of the instrumentation being tested from the
corrected readings of a traceable standard.
Controller - Permanently installed instrument used to maintain the set process
temperature during any thermal processes.
Correction Factor - The number of degrees, determined from the most recent
calibration which must be added or subtracted from the sensor and/or instrument
reading to obtain NIST true temperature.
Heat Sensitive Marker - Marker used to witness the maximum temperature
achieved during a thermal operation. Usually used during hot forming or
preheating operations.
High Limit Instrument - Temperature instrument that causes shutdown of the
heat source when a safe temperature is exceeded.
Instrumentation System Accuracy Check - An on-site comparison of the
process instrumentation readings (i.e. controller, recorder, indicator, high limit or
process sensors) with readings of test instrumentation to determine if the
measured deviations are within the requirements of Table 4 of this specification.
Load Sensor - Sensor that is attached to the production parts or a representation
of the production parts, that supplies temperature data to a working instrument.
Recorder - Permanently installed instrument that records production load and/or
working zone data.
Sensitivity - The temperature change in the input that is required to activate a
change, either upscale or down scale on the instrumentation.
Temperature Uniformity Survey (TUS) - A survey with calibrated test
instruments to determine the temperature uniformity in the process equipment
prior to and after stabilization.
Test Instrument - Instrumentation that meets the requirements of Section 4.6 and
Table 4 and is used to conduct on-site tests of thermal processing.
Test Sensor - Sensor used to perform instrumentation system accuracy check or
temperature uniformity survey.

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Working (Process) Instrument - Instrument that meets the requirements of

Section 4.1.1 and Table 4 and is used to record, control and indicate temperature
during thermal processing.
Working Sensor - Permanent sensor installed in the process equipment, that
supply temperature data to working instruments required by the equipment type as
defined in Table 2 of this specification. These also include additional sheathed
thermocouples permanently installed on tools as required by some process
specifications. The equipment type required is specified in the applicable process
specification.
Work Zone - The zone within the process equipment which has been established
during the uniformity survey as meeting the temperature tolerances of the
applicable equipment classification.

4 FACILITIES

4.1 INSTRUMENTATION REQUIREMENTS FOR MATERIAL PROCESSING

EQUIPMENT

4.1.1 General

Temperature sensors shall be adequately located to read a temperature that is

representative of each work zone of the thermal processing equipment, as
specified in Table 2.
Thermal equipment with multiple work zones shall be equipped with independent
thermal systems (thermal sensors and controller/recorder) for each zone.
Independent channels multipoint instruments can be used for recording.
Controlling and recording sensors shall be as defined in section 4.5.
For multipoint recording instruments, printing speed shall be such that the
temperature from each process sensor is recorded at least once every 5 minutes.
Electronic data storage systems, if used, shall record data at equivalent intervals
with accuracy as specified in Table 4.
Central data acquisition systems may be used only if a hard copy printout can be
obtained at any time.
Output of sensors shall be converted to temperature readings by working
instruments calibrated against test instruments whose calibration is traceable to
NIST (National Institute of Standardization and Testing) or by a national standard
body recognized by NIST.
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Calibration and maintenance of indicators, recorders, controllers and

overtemperature instrumentation shall be performed to the frequency of Table 4
and shall meet the acceptance criteria of Table 4.
Working instruments shall be calibrated controlling, recording and indicating
potentiometers of the automatically functioning, electronic null-balance type
having a constant voltage unit, or instruments of solid state devices of equivalent
or greater accuracy. Working instruments shall have a sensitivity of at least 1oF
(0.6ºC) for Class 5, 10 and 15, and of at least 3ºF (1.7ºC) for Class 25 and 50.

4.2 REFRIGERATORS

Refrigeration equipment shall be equipped with an independent or combination of

controller and indicator/recorder. Temperature sensors shall be located at the
temperature mid-point of the working zone. Liquid nitrogen, dry ice and dry
ice/liquid cooled refrigerators shall be equipped with an indicator as a minimum.

4.3 QUENCH BATHS

Quenching equipment used for heat treatment shall be equipped with an

indicating-controller or an indicator as required by the applicable process
specification. The temperature sensors shall be located at the temperature mid-
point of the equipment.

4.4 CHEMICAL PROCESSING EQUIPMENT

The chemical processing tanks shall be equipped with a controller and a recorder
and shall meet all other requirements of the applicable process specification.
For chemical processing tanks, when the heating elements are located inside the
tank, the temperature sensors shall be located at the average temperature point of
the tank.
When the solution is heated by an external exchanger system, the recorder may be
located on the tank outlet pipe immediately at the tank exit. This is permitted only
after the temperature uniformity survey and pyrometric system checks have
proven conformance to the relevant class of equipment required per the applicable
Bombardier Aerospace Materials and Processes Specification.

4.5 TEMPERATURE SENSORS

Sensor calibration shall be traceable to NIST (or by a national standard body

recognized by NIST) by a technique compatible with, or equivalent to, ASTM E
207 or ASTM E 220.
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Limits of error, correction factors and deviations shall be in accordance with

ASTM E 230.
Sensors shall be calibrated in the temperature ranges in which they are used. For
Class 5 and Class 10 equipment, calibration intervals shall be every 100°F
(37.8ºC) between the minimum and the maximum temperatures at which they will
be used. All other sensors shall be calibrated within 150°F (65.6ºC) of the
minimum and maximum temperature at which they will be used and at a
maximum of 500°F (260.0ºC) intervals between the extremes. For equipment used
for the heat treatment of metals (BAPS 168 series), calibration intervals shall not
exceed 250°F (121.1ºC) for all Classes.

4.5.1 Thermocouples

For process and test thermocouples, use gage and alloy that is consistent with the
accuracy, sensitivity and thermocouple life required for the applicable process
conditions. Thermocouples shall be adequately protected from deterioration
caused by furnace atmosphere, bath liquids and physical abuse.
Thermocouple calibration intervals specified in Table 4, are the maximums
permitted. However, compliance with these intervals does not relieve the user of
the responsibility for ensuring that excessive drift has not occurred under the
particular conditions (environment, time, and temperature) of exposure. Shorter
intervals should be used until an operating history is developed to justify the
maximum limits or establish limits for the particular normal, and extremes of
exposure conditions.
Thermocouples covered by this specification shall be of the special limit error
type of ASTM E230.
Thermocouples made from calibrated wire rolls may be used in lieu of
individually calibrated thermocouples.
Each stock length of insulated thermocouple wire shall be calibrated as a roll in
accordance with Section 4.5 and as follows:
- For rolls of wire up to 3000 ft., 1 thermocouple from each end of rolls of wire
shall be calibrated.
- For rolls of wire over 3000 ft. in length, calibrate one thermocouple from each
end and every 3000 ft. between.
Results shall meet the requirements of this section and in addition, all
thermocouples from the same roll must agree within 1°F (0.6ºC) for each
calibration temperature. If results do not agree, calibrate thermocouples from
intermediate locations. Only segments that meet the 1°F requirement shall be
used.
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Each thermocouple shall be identified with a tag that refers to the related
calibration laboratory report number.
The corrections shown in the calibration laboratory report of a given number shall
be used for all temperature readings taken on thermocouples tagged with the given
number.

4.5.2 Re-use of Thermocouples

Re-use of base-metal thermocouples (E, J, K, N, T) for tests, calibrations or loads,

shall be limited as follows:
- The re-use of thermocouples is prohibited unless the insulation remains intact,
the wires are not kinked or damaged, and the hot junction is undamaged.
- Thermocouples exposed to temperature above 1000°F (537.5ºC) shall not be
re-used.
- Thermocouples exposed to temperatures from 500°F (260.0ºC) up to and
including 1000°F shall not be used more than 10 times.
- Thermocouples exposed to temperatures between 300°F (149.0ºC) and 500°F
(260.0ºC) shall not be used more than 20 times.
- For temperatures below 300°F (149.0ºC), thermocouples shall not be used
more than 30 times or for a maximum of one year.
- When re-using type K thermocouples, at temperature above 600°F (315.5ºC),
the insertion depth shall be the same or greater than the insertion depth of the
previous application.
Base metal thermocouples shall not be recalibrated.

4.6 TEST INSTRUMENTS

Potentiometric instrumentation, other than battery type instruments shall have

automatic standardization systems using a constant voltage reference source. Test
instruments shall be calibrated against instruments whose calibration is traceable
to NIST or by a national standard body recognized by NIST (primary or
secondary type of standards) and shall meet the requirements of Table 4.
Primary standard cells/instruments shall be calibrated against reference standards
calibrated by NIST or by a national standard body recognized by NIST and shall
meet the requirements of Table 4.
Secondary standard instruments shall be calibrated against primary standard
cells/instruments and shall meet the requirements of Table 4.
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5 MATERIALS

5.1 AIRCRAFT AND PROCESS MATERIALS

All aircraft materials and process materials listed in this section shall be controlled
in accordance with BAEMM-001.
852-4875175 Chromel-Alumel Thermocouple
8524875183 Copper-Constantin Thermocouple
852-4875183 Chromel-Alumel Thermocouple
MIL-W-5846 Chromel-Alumel Thermocouple
MIL-W-5908 Copper-Constantin Thermocouple
The use of other thermocouples is allowed as long as they meet the requirements
of this specification in its entirety.

5.2 MISCELLANEOUS

Materials listed in this section shall meet only those requirements stated
specifically against them in this section. BAEMM-001 is not applicable.
Heat sensitive markers must have an accuracy of ±1% of their stated temperature.
Heat sensitive markers must be supplied as a lot, and shall be certified in
accordance with ISO 10012-1.
At Bombardier, each lot of markers along with the calibration report shall be sent
to the metrology authority for identification and approval prior to being released
for production.

6 HEALTH AND SAFETY

Some of the materials used in this Specification may be toxic, flammable and/or
irritating to the skin.
At Bombardier, consult Health and Safety Department for specific handling
precautions.
Outside Bombardier, the user is solely responsible to consult with the appropriate
health and safety authority for specific requirements related to facilities,
equipment, ventilation and handling precautions.
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7 REQUIREMENTS
Bombardier sites, and subcontractors shall process in strict accordance with this
specification and all sub-tier specifications, modified if necessary only by change
formally approved by BAMPE in response to request for deviation using form
BT0213-01.

8 TESTING PROCEDURE

8.1 GENERAL

Heat sensitive markers procured in accordance with section 5 are indicators only.
These markers may be used as temperature indicators for forming process or pre-
heating prior to welding.
Heat sensitive markers shall not be used for temperature uniformity survey,
instrumentation system accuracy check or instrument calibration.

8.2 TEMPERATURE UNIFORMITY SURVEY

The temperature uniformity survey (T.U.S.) shall be performed in each working

zone of each thermal processing equipment using test instruments and sensors
calibrated per Section 4.
The T.U.S. shall be conducted at any convenient operating temperature within the
qualified temperature range as defined in Section 8.2.4 of this specification.
If the thermal equipment is used at 2 different temperature ranges, the T.U.S. shall
be performed at 2 different operating temperatures within the qualified ranges as
defined in section 8.2.4 of this specification.

8.2.1 Equipment Conditioning

T.U.S. shall be performed while the thermal processing equipment is functioning

at normal operating temperatures with a typical or simulated production load. The
normal production environment or atmosphere shall be used during the T.U.S. Gas
carburizing or gas nitriding thermal processing equipment conditioning may be
accomplished in air.
Alternately, for heat treatment of metals (BAPS 168 series), the T.U.S. may be
performed empty provided it is performed with the relevant heat treatment

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auxiliary equipment (baskets, cages, trays, etc.) as per the normal

operation/production conditions.
Thermal processing equipment shall not be preheated above the survey
temperature to reduce stabilization time or to improve temperature uniformity.
At the time of test sensor insertion, the thermal processing equipment door (if
applicable) shall remain open for a time period representative of that necessary to
insert an average production load.

8.2.2 Recording Data

Readings of the test sensors shall be started immediately after insertion of the
sensors in the equipment. Readings shall be continued with sufficient frequency
(maximum interval of five minutes between readings), to determine when the
hottest test sensor approaches the minimum of the equipment temperature
tolerance range as specified in Table 1 and Table 4.
From this stage until stable thermal conditions are reached in the equipment,
readings of the test sensors shall be continued at intervals of two minutes, in order
to detect any overshooting.
After stable thermal conditions are reached in the equipment at the control
temperature, readings of the test sensors shall be continued at intervals of five
minutes for sufficient time to determine the recurrent temperature pattern and in
any case for not less than thirty minutes.
In parallel, record process sensor temperatures at intervals of 5 minutes or less.
These process sensor readings shall be compared with adjacent test thermocouple
readings, to determine the ability of the process sensors to represent and control
the thermal equipment uniformity within the specified temperature range. These
comparison readings shall be recorded and maintained as part of each survey
record.
For requalification surveys of salt quench tanks, hot water quench tanks and
chemical processing tanks, a single test thermocouple in a protective tube may be
used. Hold this test thermocouple, in each test location as defined in section 8.2.3,
until temperature stability is obtained and record for 30 minutes. Monitor at least
one extra location near the heat source for 30 minutes recording the temperature
every two minutes.
During stable thermal conditions and until the end of the test, the minimum and
maximum values reported from all the test sensors shall be within the process
temperature requirements.

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8.2.3 Test Sensor Locations

In equipment used for heat treatment of metals, the location pattern must be based
on a minimum of 9 test sensors or 1 per 25 cubic feet of working zone volume,
whichever is greater, for furnaces up to 500 cubic feet. Over 500 cubic feet, the
number of test sensors shall be calculated as follow: 20 + 0.2 X working zone
volume in ft3. In all cases, there should be 1 test sensor in each corner and at the
center of the working zone.
In salt baths used for heat treatment of metals, the pattern for both initial
qualification and requalification should be based on a minimum of 9 test sensors
or 1 per 40 cubic feet of working zone, whichever is greater. In all cases, there
should be 1 test sensor in each corner and 1 in the center of the working zone.
For autoclaves, the test sensor pattern should be based on one per 15 cubic feet of
working zone volume up to a maximum of 40 sensors.
For quenching tanks (hot water and salt quench tanks) and chemical processing
equipment, use the number of sensors defined in Table 3 according to the volume
and geometry of the tank.

TABLE 3 SENSOR LOCATIONS FOR CHEMICAL PROCESSING TANKS [1]

TANK VOLUME IMP. GAL MINIMUM NUMBER OF

THERMOCOUPLES

100-1000 incl. 9
over 1000 to 10000 incl. 13
over 10000 17

NOTE: [1] Sensors shall be equally distributed inside the tank, in all cases,
there should be 1 test sensor in each corner and one in the center
of the working zone.

8.2.4 Qualification Temperature Uniformity Survey

The qualification T.U.S. shall be conducted in accordance with Section 8.2 with
the following additions.
The qualification T.U.S. shall be conducted at the minimum and maximum
operation temperatures of the equipment.
Where the equipment is used for different thermal processes (e.g. solution heat
treatment and aging), the qualification T.U.S. shall be conducted at the minimum
and maximum operating temperatures of each process.

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For each item of equipment, the position and quantity of test sensors to be used
shall be worked out by the Metrology authority. A sketch showing the pattern and
location of test sensors together with a description of the equipment, the
dimensions of the work zone and the thermal process involved shall be kept in file
and made available to Bombardier upon request.
The qualification T.U.S shall include an Instrumentation System Accuracy Check
in accordance with section 8.3 of this specification. This system accuracy check
shall be performed at each T.U.S temperature with the thermal processing
equipment empty (free of any load).
This initial qualification temperature uniformity survey is not applicable to the
following types of equipment:
- Drying ovens
- Refrigerators or cooling equipment
- Pre-heating equipment
- Hot forming equipment

8.3 INSTRUMENTATION SYSTEM ACCURACY CHECK

Instrumentation system accuracy checks shall be performed when the thermal

processing equipment is at normal operating temperature.
The system accuracy check is not required to hot forming dies or tooling.
This test shall be performed using test instruments calibrated in accordance with
section 4.6 of this specification.
The system accuracy check shall consist of placing test sensors within 3 inches of
the process sensors and compare temperature readings.
The process instrumentation system shall show temperature readings within the
instrumentation accuracy shown in Table 4 for the applicable process equipment
class.
Where the system accuracy limits per Table 4 are exceeded, the process
instrument system may be adjusted to the maximum number of degrees specified
in Table 4.
If after adjustment per the above paragraph, the accuracy limits of the process
instrument system are still exceeded, production in the processing equipment
involved shall be stopped until the working system has been corrected.
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For multi-zone equipment, the instrumentation system accuracy check shall be

repeated for each working sensor.
For quench tanks, salt baths or chemical processing equipment, the working
sensors may be removed from the tank and inserted into a portable temperature
calibrator in accordance with section 4.6 of this specification.

9 QUALITY CONTROL

9.1 RECORDS

Calibration records, thermal process logs, records of temperature uniformity

surveys and instrumentation system accuracy checks shall be maintained and
signed by the Metrology authority and Quality Control.
Records shall be retained on file for the following minimum time periods.
- Calibration records and records of temperature uniformity surveys and
instrumentation system accuracy checks shall be maintained on file for a
minimum of 2 years.
- Process records shall be maintained on file for the time specified in the
applicable process specification. If no minimum time is specified in the
applicable process specification, process records shall be retained for a
minimum of 5 years.
Whenever temperature uniformity survey, instrumentation system accuracy check,
calibration of working or testing instruments or sensors has been performed
successfully, a calibration sticker shall be attached to the newly calibrated
equipment. This calibration sticker shall show the following information, as
applicable:

- Date of calibration
- Next due date
- Type of calibration
- Metrology authority signature
- Quality Control stamps

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9.2 QUALITY CONTROL REQUIREMENTS

Unless otherwise specified in the applicable process specification, quality control

requirements and acceptance criteria are defined in Table 4.

Any deviation outside the tolerances allowed per Table 4 shall be investigated and
corrected before performing any additional thermal processing. Alleviating the
difference by adjustment or offsetting outside the limits of Table 4, without
determining the cause of the difference and correcting it, is prohibited.

In addition, the Quality Control department shall evaluate whether the deviation
could have resulted in raw material or parts processed outside the required
temperature control requirements in the governing process specification. Material
or parts processed outside the temperature control requirements of the governing
process specification shall be submitted to Material Review Board action.

TABLE 4 QUALITY CONTROL AND ACCEPTANCE CRITERIA

Equipment
Class and Type Acceptance
Test Procedure Frequency
Criteria [1]
Class Type
5 A Monthly ± 5ºF (2.8ºC) inside
B the working zone
Temperature
Uniformity Survey 10 A Monthly ± 10ºF (5.6ºC) inside
per section 8.2 B the working zone
[2] [3] [4] [5] [6] [14] 15 A Monthly ± 15ºF (8.3ºC) inside
B, C the working zone
25 A Semi-Annually ± 25ºF (13.9ºC) inside
the working zone
B, C Quarterly ± 25ºF (13.9ºC) inside
D, E the working zone
50 B, C Semi-Annually ± 50ºF (27.8ºC) inside
D, E the working zone

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Equipment
Class and Type Acceptance
Test Procedure Frequency
Criteria [1]
Class Type
Instrumentation System Accuracy 5 A Weekly ± 2ºF (1.1ºC) with a
Check per Section 8.3 B maximum instrument
[4] [6] [7] [8] [9] [14] adjustment of ± 3ºF
(1.7ºC)
10 A Weekly ± 3ºF (1.7ºC) with a
B maximum instrument
adjustment of ± 5ºF
(2.8ºC)
15 A Weekly ± 4ºF (2.2ºC) with a
B maximum instrument
C adjustment of ± 5ºF
(2.8ºC)
A Monthly ± 5ºF (2.8ºC) with a
maximum instrument
adjustment of ± 5ºF
25 (2.8ºC)
[10] B, C Weekly ± 5ºF (2.8ºC) with a
D, E maximum instrument
adjustment of ± 5ºF
(2.8ºC)
50 B, C Monthly ± 10ºF (5.6ºC) with a
[11] D, E maximum instrument
adjustment of 1% of
the scale
Calibration of Working 5 All Monthly ± 2ºF (1.1ºC) or ± 0.3
Instruments [12] [15] % of the instrument
10 All Monthly
range whichever is
15 All Quarterly greater.
25 All Quarterly ± 2ºF (1.1ºC) for
digital instruments.
50 All Semi-Annually
Calibration of Test Instruments N/A N/A Quarterly ± 1ºF (0.6ºC) up to
1000ºF (537.8ºC)
± 0.2% above 1000ºF
(537.8ºC)
Calibration of Secondary Standards N/A N/A Yearly ±0.3ºF (0.2ºC) or
±0.05% of reading,
whichever is greater

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Equipment
Class and Type Acceptance
Test Procedure Frequency
Criteria [1]
Class Type
Calibration of Primary Standards N/A N/A 3 years ±0.1ºF (0.06ºC) or
±0.015% of reading,
whichever is greater
Calibration of Working Permanent N/A N/A Before ± 2ºF (1.1ºC) or 0.4%
Sensors installation of reading,
Load and Test Sheathed N/A N/A 6 Months ± 2ºF (1.1ºC) or 0.4%
Thermocouples Thermocouples of reading
per Section 4.5 [13]
Nobel Non- N/A N/A 3 Months ± 2ºF (1.1ºC) or 0.4%
Sheathed of reading
Thermocouples

NOTES:

[1] Acceptance criteria are inclusive of sensor or recording instrumentation correction factors.

[2] The frequency of temperature surveys for equipment classes 5, 10, 15 and 25 may be reduced to
a maximum of semi-annually. The frequency reduction may be implemented, provided that the
equipment meets at least one of the following requirements:
a) There must be at least 2 recording sensors in each work zone, as defined in Table 2 for
instrumentation type A, or as defined in Table 2 with, in addition, duel working instruments,
which means that a check sensor is permanently installed in the thermal equipment in such a
way that it measuring device is within 3 inches of the equipment working sensor for
instrumentation type B. In both cases, there must be a history of continuously satisfactory
performance, including a record of consecutive satisfactory thermal surveys over a period of
6 months immediately prior.
b) The thermal equipment is not used for metal heat treatment (solution H.T., annealing, age,
temper, stress relief, etc.) or adhesive bonding.
c) For equipment using load sensors, after completion of 2 consecutive successful periodic
T.U.S in accordance with this Table, provided that a written preventive maintenance plan is
established which includes a schedule for replacing working sensors and recording of all
maintenance operations.

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Class and Type Acceptance
Test Procedure Frequency
Criteria [1]
Class Type

[3] Chemical process tanks, may be surveyed on a yearly basis only. Quench baths and refrigerators
do not require temperature uniformity survey to be performed unless otherwise required in the
applicable process specification.

[4] For equipment used for adhesive bonding, temperature uniformity surveys and instrumentation
system accuracy checks may be waived provided that load sensors are inserted at the glue line of
the parts (minimum of 4 per load). Alternatively, sensors permanently attached to the bonding
fixture may be used as load sensors.
[5] Cavity and platen presses used for adhesive bonding that meet the equipment requirements of
class 10 Type A, do not require temperature uniformity surveys.
[6] For hot forming presses used for forming metal parts, the temperature uniformity survey and
instrumentation system accuracy check may be waived if heat sensitive markers are used as
indicators of temperature on each part to be formed.
[7] For chemical processing equipment, instrumentation system accuracy check shall be performed
quarterly on a minimum period of 2 years. Then the maximum interval may be increased to a
maximum of one year.
[8] For drying ovens, refrigerators and quench tanks, instrumentation system accuracy check shall
be performed on a yearly basis.
[9] These requirements are applicable to regular working instrument system only. Dual working
instrument, which means that a check sensor is permanently installed in the thermal equipment
in such a way that its measuring device is within 3 inches of the equipment working sensor, shall
be tested as follows:
- A comparison shall be performed daily by the Quality Control department between the
reading from the working sensor(s) and the corresponding check sensor(s).
- The instrumentation system accuracy shall be as per Table 4 for the applicable equipment
class.
- For thermal equipment used for adhesive bonding, daily comparison may be waived provided
that load sensors are inserted at the glue line of the parts (minimum of 4 per load).
Alternatively, sensors permanently attached to the bonding fixture may be considered as load
sensors.
- In addition a weekly check of non-controlling working instrument shall be performed by the
Quality Control department. The requirements of this Table for the applicable temperature
tolerance shall be met.
- Finally, instrumentation system accuracy check shall be performed on a Quarterly basis for
all classes of equipment. The frequency may be decreased to semi-annually if the permanent
check sensors are sheathed thermocouples.

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Class and Type Acceptance
Test Procedure Frequency
Criteria [1]
Class Type
[10] For Class 25 equipment, instrumentation system accuracy may be 0.5% of reading above 1000ºF
(537.8º C)
[11] For Class 50 equipment, instrumentation system accuracy may be 1% of reading above 1000ºF
(537.8º C)
[12] For thermal equipment used for adhesive bonding, the frequency of calibration of working
instruments is 6 months.
[13] For sheathed thermocouples used as load or tested sensors, the frequency of inspection may be
reduced to a maximum of annually, provided that there is a history of continuously satisfactory
performance, including a record of 2 consecutive satisfactory calibrations the year immediately
prior.
[14] For equipment used for heat treatment of metals (BAPS 168 series), frequency may be reduced
in accordance with AMS 2750 issue D
[15] Calibration of digital instruments may be extended to quarterly for Class 10 equipment

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