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JJF 1176-2024: Calibration Specification for (0～2 300) ℃ Tungsten Rhenium Thermocouples
Status: Valid JJF 1176: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJF 1176-2024 | English | 439 |
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Calibration Specification for (0～2 300) ℃ Tungsten Rhenium Thermocouples
| Valid |
JJF 1176-2024
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| JJF 1176-2007 | English | 469 |
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Calibration Specification for (0~1500) Celsius Tungsten-Rhenium Thermocouples
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JJF 1176-2007
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Basic data | Standard ID | JJF 1176-2024 (JJF1176-2024) | | Description (Translated English) | Calibration Specification for (0��2 300) �� Tungsten Rhenium Thermocouples | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 21,267 | | Date of Issue | 2024-09-18 | | Date of Implementation | 2025-03-18 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1176-2024: Calibration Specification for (0～2 300) ℃ Tungsten Rhenium Thermocouples---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
(0~2300)℃ Tungsten-Rhenium Thermocouple Calibration Specification
Released on 2024-09-18
2025-03-18 Implementation
The State Administration for Market Regulation issued
(0~2300)℃ Tungsten-Rhenium Thermocouple Calibration Specification
Replaces JJF 1176-2007
Responsible unit. National Temperature Measurement Technical Committee
Main drafting unit. China Aviation Industry Corporation Beijing Great Wall Metrology and Testing Technology
graduate School
Beijing Institute of Metrology and Testing Science
Participating in the drafting. Chongqing Dazheng Instrument Co., Ltd.
Shenyang Dongda Sensing Technology Co., Ltd.
Chongqing Materials Research Institute Co., Ltd.
CNNC Northern Nuclear Fuel Components Co., Ltd.
This specification is entrusted to the National Temperature Metrology Technical Committee for interpretation
The main drafters of this specification are.
Zhao Nan (Beijing Great Wall Metrology and Testing Technology Co., Ltd., Aviation Industry Corporation of China
graduate School)
Shi Qufei (Beijing Institute of Metrology and Testing Science)
Yang Xinyuan (Beijing Great Wall Metrology and Testing Technology Co., Ltd., Aviation Industry Corporation of China
graduate School)
Participating drafters.
Zhou Hongqin (Chongqing Dazheng Instrument Co., Ltd.)
Wang Kuihan (Shenyang Dongda Sensing Technology Co., Ltd.)
Liu Qi (Chongqing Materials Research Institute Co., Ltd.)
Hua Weiran (CNNC Northern Nuclear Fuel Components Co., Ltd.)
Table of contents
Introduction (II)
1 Scope(1)
2 References(1)
3 Terminology (1)
4 Overview(1)
5 Metering characteristics (3)
5.1 Insulation resistance(3)
5.2 Indication deviation (3)
6 Calibration conditions(3)
6.1 Environmental conditions(3)
6.2 Measurement standards and other equipment (3)
7 Calibration items and calibration methods (5)
7.1 Calibration Items(5)
7.2 Calibration method (5)
7.3 Data processing (6)
8 Calibration results (7)
9 Recalibration interval (8)
Appendix A Reference Format for Calibration Records of Tungsten-Rhenium Thermocouples (9)
Appendix B Reference format for calibration results of tungsten-rhenium thermocouples (10)
Appendix C Example of uncertainty assessment for 1000℃ calibration results of tungsten-rhenium thermocouples (11)
Introduction
JJF 1071 "Rules for the Preparation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions" and
JJF 1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the preparation of this specification
specification.
This specification is a revision of JJF 1176-2007 "(0~1500)℃ Tungsten-Rhenium Thermocouple Calibration Specification".
The technical changes are as follows.
---The applicable range is extended from (0~1500)℃ to (0~2300)℃, and the length of the tungsten-rhenium thermocouple protection tube is increased.
Degree limitation;
---Insulation resistance has been added to the calibration items;
--- Added technical requirements, calibration methods and data for 1500℃~2300℃ tungsten-rhenium thermocouple calibration equipment
Description of the treatment method;
---The uncertainty of the calibration results of tungsten-rhenium thermocouples was re-evaluated.
The previous versions of this specification are as follows.
---JJF 1176-2007.
(0~2300)℃ Tungsten-Rhenium Thermocouple Calibration Specification
1 Scope
This specification applies to the calibration of non-detachable tungsten-rhenium thermocouples with a temperature range of (0~2300)℃.
Calibration below 1100℃ is applicable to tungsten-rhenium thermocouples with protection tube length not less than 300mm, (1100~2300)℃
The calibration is applicable to tungsten-rhenium thermocouples with protection tube length not less than 600mm.
Other types of high temperature thermocouples may be calibrated with reference to this specification.
2 References
This specification references the following documents.
JJG856-2015 Verification procedures for working radiation thermometers
JJF 1007-2007 Temperature measurement terms and definitions
JJF 1262-2010 Armored Thermocouple Calibration Specification
JJF 1637-2017 Calibration Specification for Low-cost Metal Thermocouples
GB/T 16839.1-2018 Thermocouples Part 1.Electromotive force specifications and tolerances
GB/T 29822-2013 Tungsten-rhenium thermocouple wire and indexing table
JB/T 12529-2015 Technical requirements for industrial tungsten-rhenium thermocouples
ASTM E452-02 (2013) Standard Test Method for Calibration of Refractory Metal Thermocouples Using Radiation Thermometers
diationThermometer)
For any referenced document with a date, only the version with the date is applicable to this specification; for any referenced document without a date,
The latest version (including all amendments) shall apply to this specification.
3 Terminology
The terms and definitions defined in JJF 1007-2007 and the following apply to this specification.
Thermocouples made of tungsten-rhenium thermocouple wire encapsulated in a non-detachable protective tube.
3.2 indication deviation
The difference between the actual thermoelectric emf of a thermocouple and the thermoelectric emf of a reference scale at the same temperature. Often converted to temperature difference
express.
4 Overview
The basic principle of temperature measurement with tungsten-rhenium thermocouples is that two homogeneous conductors with different tungsten-rhenium components form a closed loop.
When the temperatures at the two ends are different, a thermoelectric potential will be generated in the circuit. This phenomenon is called the thermoelectric effect, also known as the Seebeck effect.
Two homogeneous conductors of different components are thermocouples. One end of the two thermocouples is connected together to form a measuring end.
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