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GB/T 27759-2011 English PDF

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GB/T 27759-2011: Measurement of fluid flow -- Procedures for the evaluation of uncertainties
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Basic data

Standard ID GB/T 27759-2011 (GB/T27759-2011)
Description (Translated English) Measurement of fluid flow -- Procedures for the evaluation of uncertainties
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard N12
Classification of International Standard 17.120.10
Word Count Estimation 57,538
Date of Issue 2011-12-30
Date of Implementation 2012-05-01
Quoted Standard ISO GUM-1995; VIM-1993
Adopted Standard ISO 5168-2005, IDT
Regulation (derived from) Announcement of Newly Approved National Standards No. 22 of 2011
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the speed room air conditioners limit value of energy efficiency, evaluating values ??of energy, energy efficiency rating, test methods and inspection rules. This standard applies to the use of air -cooled condenser, fully enclosed speed-controlled electric compressor, the rated cooling capacity of 14 000 W and below, the climate types of T1 speed room air conditioners. This standard does not apply to portable air conditioners, multi air conditioning units, duct type air conditioner.

GB/T 27759-2011: Measurement of fluid flow -- Procedures for the evaluation of uncertainties

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Measurement of fluid flow. Procedures for the evaluation of uncertainties ICS 17.120.10 N12 National Standards of People's Republic of China Fluid Flow Measurement Uncertainty Evaluation Program (ISO 5168.2005, IDT) Issued on. 2011-12-30 2012-05-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 4 Symbols and abbreviations 3 4.1 Symbols 3 4.2 Subscripts 5 Evaluation of uncertainty in measurement 5 6 Uncertainty Evaluation of Class A 6 6 6.1 General 6 6.2 Calculation Step 7 7 Class B Uncertainty Evaluation 7 7.1 General 7 7.2 Calculation Method 7 7.3 rectangular probability distribution 8 7.4 normal probability distribution 8 7.5 8 triangular probability distribution 7.6 bimodal probability distribution 8 7.7 determine the probability distribution of 8 7.8 asymmetric probability distribution 8 8 9 sensitivity coefficient 8.1 General 9 8.2 Analysis 9 8.3 Numerical Method 9 Synthesis of 10 9 Uncertainty 10 represents the results of 10 10.1 Expanded Uncertainty 10 11 10.2 List of Uncertainty Appendix A (normative) uncertainty calculation step 13 Appendix B (normative) probability distribution 15 Annex C (normative) contains the factor 17 Basic statistical concepts Appendix D (informative) Evaluation for Uncertainty A class of 18 Sources Appendix E (normative) Measurement Uncertainty 28 Annex F (informative) related to input variables 30 Annex G (informative) Example 31 Appendix H (informative) in the standard flowmeter calibration apparatus 45 Annex I (informative) "random" and "system" sources of uncertainty on the uncertainty contribution with Class A and Class B Uncertainty Relationship 48 Appendix J (informative) two or more parallel special circumstances flowmeter 49 Annex K (informative) Uncertainty analysis techniques can be used 51 References 52

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard uses the translation method identical with ISO 5168.2005 "Fluid Flow Measurement Uncertainty Evaluation Program" (in English). This standard makes the following editorial changes. --- Is consistent with JJF1059-1999 "Evaluation and Expression of Uncertainty in Measurement" symbol, the relative standard uncertainty of symbols for use "Urel" instead of "u *", the relative expanded uncertainty using a symbol "Urel" instead of "U *"; --- Remove the original International Standard is not in the standard normative references Normative references ISO 9300, and to include a reference literature; --- Rearrange the order of reference. The standard proposed by China Machinery Industry Federation. This standard by the national industrial process measurement and control Standardization Technical Committee (SAC/TC124) centralized. This standard was drafted. Shanghai Industrial Automation Instrumentation Institute, Naval Air Station instrumental, Shanghai Automation Instrumentation System Inspection Testing, Shanghai Institute of Measurement and Testing, Yuyao Yinhuan flow Instrument Co., Ltd. day letter Instrument Group Co., Ltd., Haiyan Majesty Test Instrument Co., Ltd., Central-day instrument Co., Ltd., Dandong Beit Engineering Automation Instrumentation Co., Ltd., Shanghai West to send Egyptian instrument packages Limited. The main drafters of this standard. Guo Aihua, Deng Jiangsheng, Gushun Feng, Zhang Jinming, Zhu Jiashun, Ye Peng, Yu Wei, Zhang Liang, Zhu Xiaoguang, Wang Jizhong. Fluid Flow Measurement Uncertainty Evaluation Program

1 Scope

This standard describes the determination and assessment of fluid flow or the total measurement uncertainty of the basic principles and procedures. Appendix A shows the step of calculating uncertainty. This standard applies to the assessment of the uncertainty of the fluid flow or the total measurement.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. ISO Guide to the Expression of Uncertainty in Measurement (GUM), 1995 (ISO Guidetotheexpressionofuncertaintyinmeasure- ment (GUM), 1995) International Basic and General Terms in Metrology (VIM), 1993 (Internationalvocabularyofbasicandgeneraltermsin metrology (VIM), 1993)

3 Terms and Definitions

ISO Guide to the Expression of Uncertainty in Measurement (GUM, 1995) and the International Basic and General Terms in Metrology (VIM, 1993) defined and The following terms and definitions apply to this document. 3.1 Uncertainty uncertainty And measuring outcomes, given reasonable parameter characterizing the dispersion of the measured values. NOTE. Uncertainty expressed as an absolute no positive and negative numbers. 3.2 Standard uncertainty standarduncertainty u (x) Measurement results with standard deviation uncertainty. 3.3 Relative standard uncertainty relativeuncertainty urel (x) Standard uncertainty divided by the best estimate. Note 1. urel (x) = u (x)/x. Note 2. urel (x) can be expressed as a percentage or parts per million. Note 3. The relative uncertainty is sometimes referred to dimensionless uncertainty. Note 4. In most cases, the best estimate is the arithmetic average of the correlation uncertainty interval. 3.4 Combined standard uncertainty combinedstandarduncertainty uc (y) Standard uncertainty of measurement results obtained from several values \u200b\u200bof other quantities. It is equal to the positive square root of the sum of these items for

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