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JJG 999-2018 English PDF

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JJG 999-2018: Digital Weighted-Method Liquid Density Meters
Status: Valid

JJG 999: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 999-2018English509 Add to Cart 4 days [Need to translate] Digital Weighted-Method Liquid Density Meters Valid JJG 999-2018
JJG 999-2005English839 Add to Cart 4 days [Need to translate] Verification regulation of digital liquid density meter-weighed method Obsolete JJG 999-2005

PDF similar to JJG 999-2018


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Basic data

Standard ID JJG 999-2018 (JJG999-2018)
Description (Translated English) Digital Weighted-Method Liquid Density Meters
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Word Count Estimation 22,281
Date of Issue 2018-02-27
Date of Implementation 2018-08-27
Older Standard (superseded by this standard) JJG 999-2005
Regulation (derived from) AQSIQ Announcement No. 26 of 2018
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine

JJG 999-2018: Digital Weighted-Method Liquid Density Meters

---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.
(Weighing digital display liquid density meter verification procedures) National Metrology Verification Regulations of the People's Republic Weighing digital liquid density meter Published on.2018-02-27 2018-08-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG 999-2005 Focal Point. National Quality Density Measurement Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting unit. Liaoning Institute of Metrology This regulation entrusts the National Quality Density Measurement Technical Committee to explain The main drafters of this procedure. Xu Changhong (China Institute of Metrology) Participate in the drafters. Xin Xin (Liaoning Institute of Metrology) Shi Wencai (China Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Weighing Digital Liquid Density Meter (1) 3.2 float (1) 4 Overview (1) 5 Metrological performance requirements (1) 6 General technical requirements (2) 6.1 float (2) 6.2 hanging wire (2) 6.3 mark (2) 7 measuring instrument control (2) 7.1 Verification conditions (2) 7.2 Verification items and verification methods (3) 7.3 Processing of verification results (5) 7.4 Verification cycle (5) Appendix A (0~40) °C pure water density table (6) Appendix B Table of Thermal Expansion Coefficients of Float Materials (8) Appendix C Capillary constant α of liquids with a density less than water (9) Appendix D Capillary constant α of liquids with a density greater than water (11) Appendix E Verification Record Reference Format (14) Appendix F Certification Certificate Inner Page Reference Format (15)

Introduction

JJF1002-2010 "Rules for the preparation of national metrological verification procedures", JJF1001-2011 "General measurement terminology and Definition", JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation" together constitutes support for the revision of this procedure The basic series of specifications. This procedure replaces JJG 999-2005, compared with JJG 999-2005 "Weighing Digital Density Meter" In addition to editorial changes, the main technical changes are as follows. --- Added introduction; --- Modified the division of the density meter level; ---Modified the requirements for the number of verifications; --- Improved the representation of temperature correction and capillary correction in data processing; --- Added (0~40) °C pure water density meter in the appendix. The previous version information of this procedure is. ---JJG 999-2005. Weighing digital liquid density meter verification procedure

1 Scope

This procedure is applicable to the first verification, subsequent verification and in-use inspection of the weighing digital liquid density meter.

2 reference files

This procedure refers to the following documents. JJF1229-2009 Terms and definitions of mass density measurement JJG 2094-2010 Density measuring instrument JJG 86-2011 standard glass float meter JJG 42-2011 working glass float meter For dated references, only the dated version applies to this Code; any undated quotation The latest version (including all amendments) applies to this procedure.

3 terms and units of measure

3.1 Weighing digital liquid density meter digitalweighted-methodliquiddensitymeter Using a load cell to convert the buoyancy of a certain volume of float immersed in the liquid to be measured into an electrical signal and Output to the display meter, which in turn displays the meter for the amount of liquid density. Its unit is kg/m3 or g/cm3. 3.2 float float The weighing digital liquid density meter has a certain volume and mass for immersing in the liquid to be tested and feeling buoyancy. part.

4 Overview

The basic principle of the weighing digital liquid density meter (hereinafter referred to as the density meter) is based on Archimedes' law, immersed The float in the liquid is subjected to upward buoyancy, and the buoyancy is equal to the weight of the liquid it displaces. The float felt by the float The force is transmitted to the force sensor, and the force sensor outputs an electrical signal to the display meter, thereby being directly available on the display meter Liquid density.

5 Metrological performance requirements

The accuracy level of the densitometer is 0.1, 0.2, 0.5, 1.0, and 10. Accuracy level See Table 1 for the relationship between the maximum allowable error and repeatability of the indication. Table 1 Density meter accuracy level and technical indicators Unit. kg/m3 Accuracy level 0.1 level 0.2 level 0.5 level 1.0 level 10 level Maximum allowable error ±0.1 ±0.2 ±0.5 ±1.0 ±10 Repeatability ≤0.1 ≤0.2 ≤0.5 ≤1.0 ≤10

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