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JJF 1991-2022 English PDF

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JJF 1991-2022: Calibration Specification for Short Base Metal Thermocouples
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JJF 1991-2022English799 Add to Cart 6 days [Need to translate] Calibration Specification for Short Base Metal Thermocouples Valid JJF 1991-2022

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Basic data

Standard ID JJF 1991-2022 (JJF1991-2022)
Description (Translated English) Calibration Specification for Short Base Metal Thermocouples
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 36,324
Date of Issue 2022-09-26
Date of Implementation 2023-03-26
Issuing agency(ies) State Administration for Market Regulation

JJF 1991-2022: Calibration Specification for Short Base Metal 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.
Calibration Specification for Short Base Metal Thermocouples National Metrology Technical Specifications of the People's Republic of China Specification for calibration of short base metal thermocouples Released on 2022-09-26 2023-03-26 Implementation Released by the State Administration for Market Regulation Specification for calibration of short base metal thermocouples Metal Thermocouples Responsible Unit. National Temperature Measurement Technical Committee Main drafting unit. Tianjin Academy of Metrology Supervision and Testing Science Liaoning Academy of Metrology Supervision and Testing Science Participating in the drafting unit. Taian Panran Measurement and Control Technology Co., Ltd. Jinan Changfeng Zhiyuan Instrument Technology Co., Ltd. This specification entrusts the National Temperature Measurement Technical Committee to be responsible for interpretation The main drafters of this specification. Wang Zhe (Tianjin Academy of Metrology Supervision and Testing) Tian Yun (Tianjin Metrology Supervision and Testing Research Institute) Hou Sulan (Liaoning Academy of Metrology Supervision and Testing Science) Participating drafters. Jiang Jing (Tianjin Academy of Metrology Supervision and Testing) Zhang Jun (Taian Panran Measurement and Control Technology Co., Ltd.) Dong Liang (Liaoning Academy of Metrology Supervision and Testing) Zhang Jiong (Jinan Changfeng Zhiyuan Instrument Technology Co., Ltd.)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 terms(1) 3.1 Compensation wire for thermocouple (1) 3.2 Equalization block(1) 4 Overview(1) 5 Insulation resistance and metrological characteristics(2) 5.1 Insulation resistance of armored couple at room temperature (2) 5.2 Thermoelectric potential deviation (2) 6 Calibration conditions(2) 6.1 Environmental conditions (2) 6.2 Measuring standards and other equipment(2) 7 Calibration Items and Calibration Methods(3) 7.1 Inspection items (3) 7.2 Calibration items(4) 7.3 Calibration method(4) 7.4 Data processing (5) 8 Calibration Results(7) 9 Recalibration interval(7) Appendix A Thermocouple Dimensions and Recommended Calibration Temperature Points(8) Appendix B Thermocouple Thermoelectric Potential Deviation Reference Table (10) Appendix C Calculation Example of Thermocouple Thermoelectric Potential Deviation (11) Appendix D Calculation method of thermoelectric potential value of standard platinum-rhodium 10-platinum thermocouple (13) Appendix E Reference Format of Calibration Original Records for Short Base Metal Thermocouples (15) Appendix F Thermocouple Calibration Result Reference Format(17) Appendix GK, N, E, J, T type thermocouple thermoelectric potential value tolerance reference table (18) Appendix HS, K, N, E, J, T thermocouple full hundred degrees Celsius point differential thermoelectric potential value table (20) Appendix J Calibration method of compensation wire for thermocouple (21) Appendix K Uniform Temperature Blocks for Tube Furnaces (23) Appendix L Example of Calibration Uncertainty Evaluation of Thermoelectric Potential Offset of Short Base Metal Thermocouples (26)

Introduction

This specification is based on JJF 1071-2010 "National Measurement and Calibration Specification Writing Rules", JJF 1001-2011 "General Using Metrology Terms and Definitions and JJF 1059.1-2012 "Assessment and Expression of Measurement Uncertainty" as the basic series of regulations Written by Fan. This specification is published for the first time. Specification for calibration of short base metal thermocouples

1 Scope

This specification is applicable to detachable electrodes with a measuring range of (-40~1000)°C and an electrode length of (300~500)mm. Calibration of unmounted base metal thermocouples and base metal armored thermocouples with a metal sheath length of (300~500) mm.

2 References

This specification references the following documents. JJG368-2000 Copper-copper-nickel thermocouple for work JJF 1262-2010 Calibration specification for armored thermocouple JJF 1637-2017 Calibration specification for base metal thermocouples GB/T 4989-2013 Compensation wires for thermocouples GB/T 16839.1-2018 Thermocouple Part 1.Electromotive force specification and tolerance GB/T 30429-2013 Industrial Thermocouples For dated references, only the dated version applies to this specification; for undated references document, its latest version (including all amendments) applies to this specification.

3 terms

Within a certain temperature range (including normal temperature), it has the same nominal value as the thermoelectric potential of the matched thermocouple. For wires with an insulating layer, use them to connect the thermocouple and the measuring device to compensate for the temperature difference between the thermocouple and the measuring device. The error caused by the difference, the compensation wire is divided into two types. extension type and compensation type. [Source. GB/T 4989-2013, 3.1.1 has been modified] 3.2 isothermalblock A high-temperature-resistant alloy cylinder uniform temperature device with sockets used in tube furnaces, used to calibrate base metal thermocouples, etc. The temperature sensor can optimize the uniformity of the temperature field of the tube furnace. In terms of type, it can be divided into. cup-shaped temperature equalizing block and jack type equalizing block warm block.

4 Overview

A thermocouple is a thermometer made of conductors of two different materials based on the Seebeck effect. Usually two different materials The conductor is called the two electrodes of the thermocouple, and one end of the two electrodes is welded together to form a measuring end, which is placed when measuring In the measured temperature field; the other end is the reference end, which is placed in a constant temperature field during measurement. The short base metal thermocouple has a shorter electrode length [the electrode length is about (300~500) mm, and the metal sleeve The length is about (300~500)mm] collectively referred to as detachable base metal thermocouples and base metal armored thermocouples. press electricity Electrode material thermocouples are divided into. nickel-chromium-nickel-silicon (K type), nickel-chromium-silicon-nickel-silicon (N-type), nickel-chromium-copper-nickel (E-type), iron- Copper-nickel (J-type) and copper-copper-nickel thermocouple (T-type).

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