AEROSPACE MATERIAL SPECIFICATION

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PYROMETRY

1. SCOPE: 1.1 This specification covers pyrometric requirements for thermal processing equipment used for heat treatment. It covers temperature sensors, instrumentation, thermal processing equipment, system accuracy tests, and temperature uniformity surveys. These are necessary to ensure that parts or raw materials are heat treated in accordance with the applicable specification(s). 1.2 This specification is not applicable to heating, or to intermediate thermal processing unless specifically referenced by a material or process specification. 1.3 This specification applies to laboratory furnaces to the extent specified in 3.6. 2. APPLICABLE DOCUMENTS: The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428 2959 or www.astm.org. ASTM E 207 Thermal EMF Test of Single Thermoelement Materials by Comparison with a Reference Thermoelement of Similar EMF-Temperature Properties ASTM E 220 Calibration of Thermocouples by Comparison Techniques ASTM E 230 Standard Specification and Temperature-Electromotive Force (EF) Tables for Standardized Thermocouples ASTM E 608 Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples ASTM E 1129 Standard Specification for Thermocouple Connectors ASTM MNL 7 Presentation of Data and Control Chart Analysis ASTM MNL 12 Use of Thermocouples in Temperature Measurement

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3. TECHNICAL REQUIREMENTS

CONTENTS

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Section Topic                                                             Page

3.1 Temperature Sensors …………………………………………………………. 4

3.1.1 General Sensor Information ………………………………………………….. 4

3.1.1.1 Sensor Certificate of Compliance Requirements …………………………… 4

3.1.1.2 Degrees to Millivolt Conversion ………………………………………………. 4

3.1.1.3 Thermocouple Calibration Requirements …………………………………… 4

3.1.1.4 Thermocouple Usage ….………………………………………………………. 5

3.1.1.5 Extension Wire …………………………………………………………………. 5

3.1.1.6     Wire Rolls - Calibration Requirements……………………………………..… 5

3.1.1.7     Wire Rolls – Maximum Allowable Length ………..………………………….. 6

3.1.1.8     Reuse of Type K and E thermocouples as Secondary Standards or SAT Sensors ……………………………………………………..…………….. 6

3.1.1.10    Expendable Base-Metal Test Thermocouple “U” Formula…………………. 6

3.1.2       Reference Standard Sensors ………………………………………………… 6

3.1.3       Primary Standard Sensors ……………………………………………………. 6

3.1.4       Secondary Standard Sensors ………………………………………………… 6

3.1.5       Temperature Uniformity Survey Sensors ……………………………………. 6

3.1.6       System Accuracy Test Sensors ……………………………………………… 7

3.1.7       Control, Monitoring, and Recording Sensors ..………………………….….. 7

3.1.8       Load Sensors ………………………………………………………………...… 7

3.2         Instrumentation ………………………………………………………………… 8

3.2.4       Controlling, Monitoring or Recording Instruments ………………………….. 9

3.2.5       Instrument Calibration (also see Table 3) …………………………………… 9

3.2.6       Instrumentation Records………………………………………………………. 10

3.2.7       Electronic Records – Instrumentation ……………………………………….. 11

3.3         Thermal Processing Equipment ……………………………………………… 11

3.3.1       Furnace Classes (also see Tables 6 and 7) ……….………..……………… 11

3.3.1.1     Instrumentation Type A ……………………………………………………….. 12

3.3.1.2     Instrumentation Type B ……………………………………………………….. 12

3.3.1.3     Instrumentation Type C ……………………………………………………….. 12

3.3.1.4     Instrumentation Type D ……………………………………………………….. 13

3.3.1.5     Instrumentation Type E ……………………………………………………….. 13

3.3.1.6.1   Instrumentation - Refrigeration Equipment …………………………………. 13

3.3.1.6.2   Instrumentation - Quench Systems ………………………………………….. 13

3.4         System Accuracy Tests (SAT’s) ……………………………………………… 13

3.4.2       System Accuracy Test Frequency (also see Tables 6 and 7) …………….. 14

3.4.3       System Accuracy Test Waiver ……………………………………………….. 14

3.4.4       System Accuracy Test Procedure ……………………………………………. 15

3.4.4.2.1   Resident Test Sensors ………………………………………………………… 15

3.4.4.8     Alternative System Accuracy Test Procedure ……………………………… 18

CONTENTS

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Section Topic                                                             Page

3.4.5 System Accuracy Test Instrumentation (also see Tables 1 and 3) ………. 18

3.4.6 Records – System Accuracy Test ……………………………………………. 18

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