JJF 1926-2021 English PDF

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JJF 1926-2021: Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1926-2021	399	Add to Cart	4 days	Calibration Specification for Thermocouples at Palladium Melting Point by Wire-Bridge Method	Valid

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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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