JJG 985-2004 English PDF

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JJG 985-2004: Verification Regulation of Reference Standard Facility of High Temperature Platinum Resistance Thermometers
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 985-2004	949	Add to Cart	6 days	Verification Regulation of Reference Standard Facility of High Temperature Platinum Resistance Thermometers	Valid

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Basic data

Standard ID: JJG 985-2004 (JJG985-2004)
Description (Translated English): Verification Regulation of Reference Standard Facility of High Temperature Platinum Resistance Thermometers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A54
Classification of International Standard: 17.220.20
Word Count Estimation: 37,369
Date of Issue: 2004-03-02
Date of Implementation: 2004-06-02
Regulation (derived from): Administration of Quality Supervision, Inspection and Quarantine of 2004 No. 24
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to working reference temperature platinum resistance thermometers and platinum resistance thermometer temperature reference means working at 0 �� ~ 961. 78 �� range of initial verification and follow-up examination.

JJG 985-2004: Verification Regulation of Reference Standard Facility of High Temperature Platinum 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 Reference Standard Facility of High Temperature Platinum Resistance Thermometers National Metrology Verification Regulations of the People's Republic High temperature platinum resistance thermometer working reference device Released on.2004-03-02 2004-06-02 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued High temperature platinum resistance thermometer works Benchmark device verification procedure Temp This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 2,.2004, and Implemented on June 2,.2004. Focal Point. National Temperature Measurement Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting unit. Kunming Dafang Automatic Control Technology Co., Ltd. This regulation entrusts the National Temperature Measurement Technical Committee to explain The main drafters of this procedure. Wang Yulan (China Institute of Metrology) Qiu Ping (China Institute of Metrology) Yan Mei (China Institute of Metrology) Participate in the drafters. Li Fuhong (Kunming Dafang Automatic Control Technology Co., Ltd.)

table of Contents

1 Scope (1) 2 Overview (1) 2.1 Definition of temperature value and interpolation method (1) 2.2 Symbol Description (2) 3 Metrological performance requirements (2) 3.1 Working reference high temperature platinum resistance thermometer (2) 3.2 Define fixed points in the working reference device (3) 4 General technical requirements (4) 4.1 Appearance Dimensions (4) 4.2 Structure (5) 5 measuring instrument control (5) 5.1 Verification conditions (5) 5.2 Verification items and verification methods (5) 5.3 Processing of verification results (10) 5.4 Verification cycle (11) Appendix A (0~961.78) °C temperature zone reference function table (12) Appendix B Coefficient Value Table of Reference Function Wr(t) (30) Appendix C Certification Certificate (Back) Format (31) Appendix D Verification Result Notice (Back) Format (32) High-temperature platinum resistance thermometer working reference device verification procedure

1 Scope

This procedure applies to the working reference high temperature platinum resistance thermometer and high temperature platinum resistance thermometer working reference device First verification and subsequent verification in the range of 0 °C ~ 961.78 °C.

2 Overview

The high-temperature platinum resistance thermometer measures the temperature according to the characteristic that the resistance of the metal platinum wire changes with temperature. Kind of instrument. High-temperature platinum resistance thermometer working reference device should include working reference high-temperature platinum resistance thermometer and definition fixed point Set. Define fixed point devices including silver freezing point, aluminum freezing point, zinc freezing point, tin freezing point, and water triple point loading Set. The high-temperature platinum resistance thermometer working reference device is used to verify the first-class standard high-temperature platinum resistance thermometer. 2.1 Definition of temperature value and interpolation method In.1990, the International Temperature Scale (ITS-90) specified temperature values in the temperature range from 0 °C to 961.78 °C as specified in a group. High-temperature platinum resistance thermometers that define fixed-point graduations, defined fixed points including silver freezing point, aluminum freezing point, zinc condensation Fixation point, tin freezing point and water triple point, and define the fixed point using the specified reference function and deviation function interpolation calculation The temperature value between. The temperature value is determined by the following formula. W(t)=R(t)/R(0.01°C) (1) Where W(t)---high-temperature platinum resistance thermometer is at the temperature t and the water triple point temperature (0.01 °C) The ratio of resistance values. The reference function of the 0°C~961.78°C temperature zone is defined as Wr(t)=C0 ∑ i=1 Ci[(t-481)/481]i (2) The inverse of equation (2) is given by the following equation, which is consistent with equation (2) within 0.13 mK. t=D0 ∑ i=1 Di[(Wr(t)-2.64)/1.64]i (3) Where t---temperature value, °C; Wr(t)---reference function, see the numerical value of the reference function Wr(t) in the temperature range from 0 °C to 961.78 °C. Appendix A; C0, D0, Ci, Di---constants are listed in Appendix B. The deviation function of the temperature range from 0 °C to 961.78 °C is ΔW(t)=W(t)-Wr(t)=a6[W(t)-1] b6[W(t)-1]2 C6[W(t)-1]3 d[W(t)-W(660.323°C)]2 (4) In the formula a6, b6, c6, d---coefficient. Below the freezing point of aluminum, d=0; the coefficients a6, b6, c6 are ......

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