JJG 344-2005 English PDF

US$629.00 · In stock
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JJG 344-2005: Verification Regulation of Ni-Cr/Au+0.07at.% Fe Thermocouple
Status: Valid

JJG 344: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 344-2005	629	Add to Cart	5 days	Verification Regulation of Ni-Cr/Au+0.07at.% Fe Thermocouple	Valid
JJG 344-1984	679	Add to Cart	5 days	Verification Regulation of Ni-Cr/Au+0. 07at% Fe Thermocouple	Obsolete

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Basic data

Standard ID: JJG 344-2005 (JJG344-2005)
Description (Translated English): Verification Regulation of Ni-Cr/Au+0.07at.% Fe Thermocouple
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A54
Classification of International Standard: 17.200
Word Count Estimation: 24,284
Date of Issue: 2005-04-28
Date of Implementation: 2005-10-28
Older Standard (superseded by this standard): JJG 344-1984
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to measuring range 4. 2K ~ 273. 15K standards and work with a nickel-chromium Gold and Iron thermocouple (hereinafter referred to as thermocouple) of the initial verification, testing and use of follow-up inspection.

JJG 344-2005: Verification Regulation of Ni-Cr/Au+0.07at.% Fe Thermocouple

---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.
Verification Regulation of Ni-Cr/Au 0.07at.% Fe Thermocouple National Metrology Verification Regulations of the People's Republic Nickel-chromium-gold-iron thermocouple Ni-Cr/Au 0.07at. Thermocouple Released on.2005-04-28 2005-10-28 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG 344-1984 This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on April 28,.2005, and since.2005. It will take effect on October 28 of the year. Focal Point. National Temperature Measurement Technical Committee Drafting unit. Liaoning Institute of Metrology Institute of Physics and Chemistry, Chinese Academy of Sciences This regulation entrusts the National Temperature Measurement Technical Committee to explain The main drafters of this procedure. Song Dehua (Liaoning Institute of Metrology) Mao Yuzhu (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) Lin Peng (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) Participate in the drafters. Zhang Ming (Liaoning Institute of Metrology) Dong Liang (Liaoning Institute of Metrology) Zhang Qinggeng (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) Yu Lihong (Institute of Physical and Chemical Technology, Chinese Academy of Sciences)

table of Contents

1 Scope (1) 2 Overview (1) 3 Metrological performance requirements (1) 3.1 Uniformity (1) 3.2 Thermoelectric Potential Range (1) 3.3 Uncertainty and annual stability of standard thermocouples (1) 3.4 Working Thermocouple Tolerance (1) 4 General technical requirements (2) 5 measuring instrument control (2) 5.1 Verification conditions (2) 5.2 Verification project (3) 5.3 Verification method (3) 5.4 Verification result processing (7) 5.5 Verification cycle (7) Appendix A Nickel-chromium-gold-iron thermocouple indexing table (reference end. 0 °C) (8) Appendix B Thermocouple Uniformity and Detection Method (11) Appendix C Standard Nickel-Chromium-Gold Iron Thermocouple Calibration Record (12) Appendix D Working Nickel-Chromium-Gold Iron Thermocouple Calibration Record (13) Appendix E Standard Nickel-Chromium-Gold Iron Thermocouple Verification Certificate and Verification Result Notice (Back) Format (14) Appendix F Example of Uncertainty Evaluation of Working Nickel-Chromium-Gold Iron Thermocouple Test Results (16) Nickel-chromium-gold iron thermocouple verification procedure

1 Scope

This procedure is applicable to standard and working nickel-chromium-gold-iron thermocouples with a measuring range of 4.2K~273.15K (the following is simple) The first test, the subsequent test and the test in use of the thermocouple.

2 Overview

Nickel-chromium-gold-iron thermocouple is a thermocouple used for deep cryogenic measurement. Its nickel-chromium alloy wire is expressed by mass ratio. Nickel 90% Chromium 10%, gold-iron alloy wire expressed as atomic ratio of gold and iron atomic percentage of 0.07.

3 Metrological performance requirements

3.1 Uniformity The thermocouple should be checked for uniformity before the production. The uneven thermal electromotive force value should not exceed the value of Table B-1. For the test method, see Appendix B. 3.2 Thermoelectric potential range After passing the uniformity test, the thermoelectromotive force value of the welded thermocouple at 4.22K and 77.34K shall not exceed The provisions of Table 1. Table 1 Thermoelectric potential range of thermocouple Thermocouple category Allowable thermoelectromotive force value/μV 4.22K 77.34K Standard Thermocouple - (5266.6 ± 2.0) - (4043.0 ± 2.0) Working Thermocouple - (5267±13) - (4043±17) 3.3 Uncertainty and annual stability of standard thermocouples The standard thermocouple verified according to this procedure shall not give an uncertainty of more than 0.2K, and the periodic verification result The difference shall not exceed the requirements of Table 2. Table 2 Annual stability of standard thermocouples (difference in cycle check results) Temperature range/K year stability/μV (reference end. 0 ° C) 4.22~77.34 ±2.0 77.34~273.15 ±2.5 3.4 Working Thermocouple Tolerance For the working thermocouples verified in accordance with this procedure, the final test results are allowed to be ±1.0K. ......

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