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JJF 1926-2021: Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method
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Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method
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JJF 1926-2021
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Basic data | Standard ID | JJF 1926-2021 (JJF1926-2021) | | Description (Translated English) | Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A54 | | Word Count Estimation | 18,142 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1926-2021: Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method
---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.
(Calibration specification for thermocouple palladium point fuse method)
National Metrology Technical Specification of the People's Republic of China
Specification for calibration of thermocouple palladium point fuse method
Published on 2021-10-18
2022-04-18 Implementation
Released by the State Administration for Market Regulation
Specification for calibration of thermocouple palladium point fuse method
Focal Point. National Thermometer Technical Committee
Main drafting unit. China Institute of Metrology
Participating in the drafting unit. Beijing Institute of Metrology and Testing Sciences
Aviation Industry Corporation of China Beijing Great Wall
Institute of Metrology and Testing Technology
Shanghai Jialing Electronic Technology Co., Ltd.
This specification entrusts the National Thermometry Technical Committee to be responsible for the interpretation
The main drafters of this specification.
Zheng Wei (China Institute of Metrology)
Participating drafters.
Wu Jian (Beijing Institute of Metrology and Testing)
Yang Yongjun (Beijing Great Wall Institute of Measurement and Testing Technology, Aviation Industry Corporation of China)
Wang Zhenhua (Shanghai Jialing Electronic Technology Co., Ltd.)
content
Introduction (Ⅱ)
1 Scope(1)
2 References (1)
3 Terms and units of measurement(1)
4 Overview(1)
5 Metrology Characteristics(1)
6 Calibration Conditions(2)
6.1 Environmental conditions (2)
6.2 Measurement standards and supporting equipment (2)
7 Calibration items and calibration methods (4)
7.1 Calibration items(4)
7.2 Calibration method(4)
7.3 Data processing(5)
8 Expression of calibration results (6)
9 Recalibration interval(6)
Appendix A Original Record Reference Format(7)
Appendix B Calibration Certificate Inside Page Reference Format(8)
Appendix C Method for Quantity Verification of Calibration Device of Palladium Point Fuse Method (9)
Appendix D Example of Measurement Uncertainty Evaluation of Calibration Result of Palladium Point Fuse Thermocouple (10)
Introduction
JJF 1071 "Rules for Compilation of National Metrology Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions",
JJF 1059.1 "Assessment and Representation of Measurement Uncertainty" together constitute the basic series of specifications supporting this specification.
This specification mainly refers to the third part of "International Temperature Scale Approximation Technology in.1990" (China Metrology Press,.1993).
Chapter "Special Fixed Point" and GB/T 18036-2008 "Measurement Method of Thermoelectromotive Force of Platinum-Rhodium Thermocouple Filament"
related content.
This specification is published for the first time.
Specification for calibration of thermocouple palladium point fuse method
1 Scope
This specification applies to high temperature thermocouples such as precious metals and tungsten rhenium (hereinafter referred to as thermocouples) at the melting point of palladium
(1554.8℃) For calibration by the fuse method, the diameter of the thermocouple electrode should be (0.3~1.0) mm, and the length should be (0.3~1.0) mm.
Not less than 750mm. Calibration using the melting point of other pure metals (eg platinum, gold) may refer to this specification.
2 Reference documents
This specification references the following documents.
JJF 1176-2007(0~1500)℃ Calibration specification for tungsten-rhenium thermocouple
GB/T 16839.1-2018 Thermocouple Part 1.Electromotive force specification and tolerance
GB/T 18036-2008 Thermoelectromotive force measurement method of platinum-rhodium thermocouple filament
GB/T 29822-2013 Tungsten-rhenium thermocouple wire and graduation table
Compiled by the International Temperature Advisory Committee. Approximation technology of the international temperature scale in.1990 [M]. Ling Shankang, Chen Xiaolin, translation.
Beijing. China Metrology Press,.1993.
For dated references, only the dated version applies to this specification; for undated references
documents, the latest edition of which (including any amendments) applies to this specification.
3 Terminology and units of measurement
The equilibrium temperature at which metal palladium transitions from the solid phase to the liquid phase is referred to as the palladium point.
Note. The metal palladium point temperature given in the "1990 International Temperature Scale Approximation Technology" in an oxygen-free environment is 1554.8 °C.
3.2 fuse method wire-bridgemethod
Use the temperature hysteresis that occurs when the pure metal wire bundled or welded at the measuring end of the thermocouple melts to calibrate the thermocouple
method, the pure metal wire materials usually recommended are palladium, gold and platinum.
4 Overview
Thermocouple palladium point fuse method calibration is a method to realize thermocouple calibration by using pure metal palladium solid-liquid phase transition. calibration
As the furnace temperature rises, when the palladium wire bundled or welded on the measuring end of the thermocouple melts and maintains the melting point temperature for a period of time
When, the thermoelectric output of the thermocouple stagnates briefly. Through continuous measurement of thermoelectric potential, data processing and analysis, the thermal
The thermoelectric potential of the galvanic couple at the palladium point.
5 Metrology characteristics
The thermoelectric characteristics of the thermocouple at the palladium point (1554.8°C) shall meet the requirements in Table 1.
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