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JJG 75-2022 English PDF

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JJG 75-2022: Standard Platinum-10%Rhodium/Platinum Thermocouples
Status: Valid

JJG 75: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 75-2022English659 Add to Cart 5 days [Need to translate] Standard Platinum-10%Rhodium/Platinum Thermocouples Valid JJG 75-2022
JJG 75-1995English559 Add to Cart 3 days [Need to translate] Verification Regulation of the Standard Platinum-10% Rhodium/Platinum Thermocouple Obsolete JJG 75-1995
JJG 75-1982EnglishRFQ ASK 3 days [Need to translate] Verification Regulation of the Standard Platinum Rhodium 10-Platinum Thermocouple Obsolete JJG 75-1982

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Basic data

Standard ID JJG 75-2022 (JJG75-2022)
Description (Translated English) Standard Platinum-10%Rhodium/Platinum Thermocouples
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A54
Word Count Estimation 32,398
Date of Issue 2022-12-27
Date of Implementation 2023-06-27
Issuing agency(ies) State Administration for Market Regulation

JJG 75-2022: Standard Platinum-10%Rhodium/Platinum 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 Verification Regulations of the People's Republic of China Standard Platinum Rhodium 10-Platinum Thermocouple Released on 2022-12-27 2023-06-27 Implementation Released by the State Administration for Market Regulation Standard Platinum Rhodium 10-Platinum Thermocouple Verification Regulations Replace JJG 75-1995 Responsible Unit. National Temperature Measurement Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting unit. Beijing Institute of Metrology and Testing Sciences Hubei Institute of Metrology and Testing Technology Xinjiang Uygur Autonomous Region Institute of Metrology and Testing Kunming Dafang Automatic Control Technology Co., Ltd. Fluke Testing Instruments (Shanghai) Co., Ltd. This regulation entrusts the National Temperature Measurement Technical Committee to be responsible for interpretation The main drafters of this regulation. Zheng Wei (National Institute of Metrology) Participating drafters. Tang Lei (National Institute of Metrology, China) Zhang Xiwen (Beijing Institute of Metrology and Testing Sciences) Luo Xiaoping (Hubei Provincial Institute of Metrology and Testing Technology) Xue Wenyan (Xinjiang Uygur Autonomous Region Institute of Metrology and Testing) Li Fuhong (Kunming Dafang Automatic Control Technology Co., Ltd.) Chen Yu [Fluke Testing Instruments (Shanghai) Co., Ltd.]

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 Overview(1) 4 Metrological performance requirements (2) 4.1 Thermoelectric characteristics (2) 4.2 Stability(2) 5 General technical requirements (2) 5.1 Electrodes(3) 5.2 Identification(3) 5.3 Structure (3) 6 Measuring Instrument Control(3) 6.1 Test conditions (3) 6.2 Verification items (5) 6.3 Verification method (5) 6.4 Processing of verification results (8) 6.5 Verification period(9) Appendix A (0~1085)℃ Temperature Zone Standard Platinum Rhodium 10-Platinum Thermocouple Thermoelectromotive Force-Temperature Calculation Method (10) Appendix B Platinum Rhodium 10-Platinum Thermocouple Thermoelectromotive Force-Temperature Reference Function (11) Appendix C Verification Record Format (14) Appendix D Verification Certificate/Verification Result Notification Inner Page Format (17) Appendix E Special Requirements for Calibration of Standard Platinum-Rhodium 10-Platinum Thermocouples with Fixed Sleeve (18) Appendix F Example of Verification Result Calculation (19) Appendix G Additional Cleaning Methods for Standard Platinum-Rhodium 10-Platinum Thermocouples(20) Appendix H Measurement Uncertainty Evaluation Example (21)

Introduction

JJF1002 "Rules for Writing National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions", JJF1059.1 "Assessment and Expression of Measurement Uncertainty" together constitute the basic series supporting the formulation and revision of this regulation specification. Compared with JJG 75-1995, except editorial modifications, the main technical changes are as follows. --- Increased the introduction part; --- Extend the lower limit of the scope of application of the regulations to 0°C; --- Increase the description of the standard thermocouple structure; --- The requirements for the thermal electromotive force of thermocouples have been adjusted; --- Deleted the operation part of making thermocouple; ---Adjusted some verification operation methods; --- Deleted the differential method measurement; --- Added the content of standard platinum-rhodium 10-platinum thermocouple with fixed casing structure. The previous releases of JJG 75-1995 are as follows. ---JJG 75-1982; --- Gauge (G) Heat-5-1965. Standard Platinum Rhodium 10-Platinum Thermocouple Verification Regulations

1 Scope

This regulation is applicable to the first-class and second-class standard platinum-rhodium 10-platinum thermocouples at (0~1084.62) °C for the first verification and subsequent verification. Continue checking.

2 References

JJF1007-2007 Terms and definitions of temperature measurement terms GB/T 1598-2010 Platinum rhodium 10-platinum thermocouple wire, platinum rhodium 13-platinum thermocouple wire, platinum rhodium 30-platinum rhodium 6 heat Galvanic wire GB/T 16839.1 Thermocouple Part 1.Electromotive force specification and tolerance For dated references, only the dated version applies to this regulation; for undated references document, its latest version (including all amendments) applies to this regulation.

3 Overview

Thermocouples use the Seebeck effect to measure temperature. Platinum Rhodium 10-Platinum Thermocouple It is a thermometer with high accuracy and good physical and chemical properties in the thermocouple series. Platinum-rhodium 10-platinum thermocouple, its positive pole (SP) is a platinum-rhodium alloy containing 10% rhodium, and its negative pole (SN) is pure platinum. standard platinum Rhodium 10-platinum thermocouples are mainly used for temperature value transmission, and can also be used for precision temperature measurement in a wider range. The basic structure of a standard platinum-rhodium 10-platinum thermocouple is shown in Figure 1.Electrodes and double-hole ceramic tubes (alumina content is not low at 95%) constitute the most basic structure of a standard platinum-rhodium 10-platinum thermocouple. The outer diameter of the double-hole ceramic tube is ϕ (3~4)mm, The hole diameter is ϕ (0.8~1.0)mm, the length is (500~550)mm, the appearance is clean and no breakage is allowed. usually at The exposed electrode part of the standard platinum-rhodium 10-platinum thermocouple is covered with a section of plastic insulating tube, and this junction should be maintained during use. structure to avoid electrode short circuit and external contamination. A part of the standard platinum-rhodium 10-platinum thermocouple is equipped with a removable ceramic outer sheath on the basis of the basic structure tube, encapsulating the reference terminal and leading out the measurement line, the structure is shown in Figure 2.It is mainly used for base metal thermocouples and armored Calibration of thermocouples or direct temperature measurement. This type of thermocouple needs to remove the ceramic outer protective sleeve before the verification. other features See Appendix E for special requirements. Figure 1 Schematic diagram of the basic structure of a standard platinum-rhodium 10-platinum thermocouple

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