JJG 858-2013 English PDF

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JJG 858-2013: Verification Regulation of Standard Rhodium-iron Resistance Thermometers
Status: Valid

JJG 858: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 858-2013	329	Add to Cart	3 days	Verification Regulation of Standard Rhodium-iron Resistance Thermometers	Valid
JJG 858-1994	239	Add to Cart	2 days	Verification Regulation of the Standard Rhodium-Iron Resistance Thermometers	Obsolete

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Basic data

Standard ID: JJG 858-2013 (JJG858-2013)
Description (Translated English): Verification Regulation of Standard Rhodium-iron Resistance Thermometers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A54
Classification of International Standard: 17.200
Word Count Estimation: 14,197
Older Standard (superseded by this standard): JJG 858-1994
Adopted Standard: CCT ITS-90, NEQ
Regulation (derived from): AQSIQ Announcement No. 74 of 2013
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to: measurement range of 0. 65 K ~ 27. 1K standard rhodium iron resistance thermometer initial verification, testing and use of the follow-up examination.

JJG 858-2013: Verification Regulation of Standard Rhodium-iron Resistance Thermometers

---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 Standard Rhodium-iron Resistance Thermometers State verification procedures People's Republic of China Standard Rh-Fe resistance thermometer Issued on. 2013-05-13 2013-11-13 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Standard Rh-Fe resistance thermometer test procedures Replacing JJG 858-1994 Focal point. the National Technical Committee of temperature measurement Drafted by. 100101 China Institute of Metrology The temperature measurement procedures commissioned the National Technical Committee is responsible for interpretation The main drafters of this procedure. Lin Peng (Institute of Physical and Chemical Technology) Qiu Ping (China Institute of Metrology) Drafters participate. Zhang Qinggeng (Institute of Physical and Chemical Technology) Wu lian (China Institute of Metrology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Overview (1) 3 metering performance requirements (2) The resistance value of 3.1 (2) 3.2 self-heating (2) The difference (2) between the test results of two 3.3 3.4 Insulation resistance (2) 4 General Requirements (2) 4.1 size requirements (2) 4.2 thermometer housing (2) 5 control of measuring instruments (2) 5.1 verification Conditions (2) 5.2 Verification Project (3) 5.3 Verification Methods (3) 5.4 Verification Results Processing (5) 5.5 test cycle (6) Appendix A calibration certificate with test results of notice data page format (7)

Introduction

This procedure is "ITS-90 temperature scale approximation technique," the English version of the International Advisory Committee temperature (CCT) according to (Tech- nologyforapproximatingtheInternationalTemperatureScaleof1990), with related research Document on JJG 858-1994 subject to revisions. Compared with JJG 858-1994, this procedure is mainly technical changes are as follows. --- Stability requirements for submission of a thermometer, the original procedures are 2mK, now changed 3mK, and test results Uncertainty 3mK consistent; --- Increase structural diagram of a rhodium-iron resistance thermometer; --- 4.2K was increased resistance ratio (0.08 ± 0.02) the request; --- Increased test point temperature interval recommended list, the original test procedure only gives the number of points, not to mention a specific interval; --- Original protocol requirements of the standard group is stable in 0.5mK, was replaced by the expanded uncertainty 1mK; --- Increasing the initial verification of the project and corresponding methods; --- Increasing the eligibility list of indicators was seized with a thermometer, test results easy to determine whether or not qualified; --- Increasing the calibration certificate and test results of notice of the data page format; --- Increasing the effective detection of the digital representation of the data requirements. JJG 858-1994 was the first to develop, publish. Standard Rh-Fe resistance thermometer test procedures

1 Scope

The order applies to the measurement range of the standard Rh-Fe resistance thermometer 0.65K ~ 27.1K initial verification, after Continued use of verification and inspection.

2 Overview

Standard Rh-Fe resistance thermometer (hereinafter referred to as "thermometer"), is made of pure rhodium alloys drawn plus 0.5% mole of iron Into filaments A resistance thermometer with no stress around the structure formed (see FIG. 1), in the 0.5K ~ 27K temperature region resistance High sensitivity, good long-term stability, suitable for use as a temperature standard 0.5K ~ 27K temperature region. Figure 1 Standard Rh-Fe resistance thermometer Schematic 1- platinum thermometer housing; 2 - worn in a glass tube spiral rhodium iron temperature sensing wire 3- welding wire to sense the temperature of a platinum wire; 4- soft glass seal Since rhodium alloy is an alloy diluted, content and distribution of iron rhodium alloy of the resistance - temperature characteristics Impact is clear, therefore thermometer must do more than point test. Test data using least squares method to do resistance - temperature characteristics Fit calculation, and then given the resistance - temperature indexing table. Thermometer test data can be used Chebyshev polynomials (1) to fit its resistance - temperature relationship. T = a02 Σ i = 1 aicos (iarccosx) = a02 Σ i = 1 aicos [iarccos (AR B)] (1) Where. --- The T temperature, K; ......

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