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JJF 1848-2020 English PDF

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JJF 1848-2020: (Nuclear belt scale calibration specification)
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Basic data

Standard ID JJF 1848-2020 (JJF1848-2020)
Description (Translated English) (Nuclear belt scale calibration specification)
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Word Count Estimation 13,153
Date of Issue 2020-07-02
Date of Implementation 2021-01-02
Older Standard (superseded by this standard) JJG 811-1993
Regulation (derived from) Announcement No. 29 (2020) of the State Administration for Market Regulation
Issuing agency(ies) State Administration for Market Regulation

JJF 1848-2020: (Nuclear belt scale calibration specification)

---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.
(Nuclear belt scale calibration specification) National Metrology Technical Specifications of the People's Republic of China Nuclear belt scale calibration specification 2020-07-02 released 2021-01-02 implementation Issued by the State Administration for Market Regulation Nuclear belt scale calibration specification Replace JJG811-1993 Focal point. National Weighing Instrument Metrology Technical Committee Automatic Weighing Instrument Sub-Technical Committee Drafting unit. Liaoning Institute of Metrology Jiangsu Institute of Metrology Beijing Institute of Metrology and Testing This specification entrusts the National Weighing Instrument Metrology Technical Committee Automatic Weighing Instrument Sub-Technical Committee to be responsible for interpretation The main drafters of this specification. Jia Yonggang (Liaoning Institute of Metrology) Hu Qiang (Jiangsu Institute of Metrology) Li Di (Liaoning Institute of Metrology) Liu Wei (Beijing Institute of Metrology and Testing Science) Guo Bojun (Liaoning Institute of Metrology) Participating drafters. Li Dongyue (Liaoning Institute of Metrology)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 3.1 Term (1) 3.2 Unit of measurement(1) 4 Overview (2) 5 Measurement characteristics (2) 5.1 The relative error of zero cumulative mass (2) 5.2 Relative deviation between simulated load measurement value and theoretical value (2) 5.3 Weighing repeatability of cumulative mass (2) 5.4 Accumulated quality error of material test (2) 6 Calibration conditions (2) 6.1 Calibration environment (2) 6.2 Measurement standards and other equipment (2) 6.3 Other conditions (3) 7 Calibration items and calibration methods (3) 7.1 Calibration items (3) 7.2 Calibration method (3) 8 Calibration result expression (4) 9 Recalibration interval (4) Appendix A. Nuclear belt scale calibration record format (recommendation) (5) Appendix B Information and format of the inside page of the certificate (6) Appendix C Examples of Uncertainty Evaluation of Cumulative Mass Calibration in Material Test (7)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "General Metrology Terms and Definitions and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" are the basic series of specifications. This specification is the revision of JJG811-1993 "Nuclear Belt Scale". Compared with JJG811-1993, except for editorial changes, the main technical changes of this specification are as follows. ---Clarified that this specification is applicable to the calibration of nuclear belt scales (see 1); ---Deleted the requirements for belt conveyors, radioactive sources, sensors, installation, etc. in the technical requirements (see 5); --- Delete the requirements related to the accuracy level in the measurement performance (see 5); ---Modified some terms and used general measurement terms (see 3); ---Modified the test content in the calibration project, deleted "zero point discrimination", "zero point stability" and other items, Replace 40% of the maximum flow rate and 80% of the maximum flow rate with the common feed flow rate for material test (see 7.2); ---Added the list of calibration items (see 7.1); ---Modified the name of the calibration item and added the formula used in the calibration (see 7); --- Amended Appendix A. Nuclear Belt Scale Calibration Record Format (Recommendation) (see Appendix A); ---Added Appendix B. Information and format of the inside page of the certificate (see Appendix B); --- Added Appendix C. Examples of Uncertainty Evaluation for Cumulative Quality Calibration of Material Tests (see Appendix C). The previous releases of this specification are as follows. ---JJG811-1993. Nuclear belt scale calibration specification

1 Scope

This specification applies to the calibration of nuclear belt scales.

2 Reference documents

This specification refers to the following documents. JJF 1181-2007 Weighing instrument measurement terms and definitions EJ/T 784 Nuclear Belt Scale For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 Terms and units of measurement

3.1 Term The following terms and definitions defined by JJF 1181-2007 are applicable to this specification. 3.1.1 Nuclear belt scale It is a belt scale that is composed of a nuclear radiation source and a detector. It uses the principle of material absorption to measure the quality of the material flowing between the radiation source and the detector. 3.1.2 Cumulative division value In the normal weighing mode, the nuclear belt scale is the difference between two adjacent indications expressed in mass units by the total accumulating device or part of the accumulating device. 3.1.3 Maximum flow The indication error of the nuclear belt scale meets the required upper limit of flow, which is usually given by the nuclear belt scale manufacturer. It is represented by the symbol Qmax. 3.1.4 Minimum flow The minimum flow rate of the material flow through the nuclear belt scale is usually equal to 20% of the maximum flow rate. It is represented by the symbol Qmin. 3.1.5 Minimum cumulative load The quantity expressed in mass units, when the cumulative value of the nuclear belt scale is lower than this value, it may exceed the specified relative error. It is represented by the symbol Σmin. The minimum cumulative load should not be less than the largest of the following values. ● 2% of accumulated load for 1h at maximum flow; ● The load obtained when the belt rotates one revolution under the maximum flow; ● 500 cumulative division values. 3.2 Unit of measurement The unit of measurement used by the nuclear belt scale should be kilogram (kg) or ton (t), which is used to simulate the areal density of the load sheet. The unit of measurement should be kilograms per square meter (kg/m2) or grams per square centimeter (g/cm2).

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