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