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JJG 42-2023: Working Glass Hydrometers
Status: Valid JJG 42: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 42-2023 | English | 1059 |
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7 days [Need to translate]
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Working Glass Hydrometers
| Valid |
JJG 42-2023
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| JJG 42-2011 | English | 1519 |
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6 days [Need to translate]
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Verification Regulation of Working Glass Hydrometers
| Obsolete |
JJG 42-2011
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| JJG 42-2001 | English | RFQ |
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6 days [Need to translate]
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Verification Regulation of Working Glass Hydrometers
| Obsolete |
JJG 42-2001
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| JJG 42-1987 | English | RFQ |
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3 days [Need to translate]
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Verification Regulation of Working Glass Hydrometers
| Obsolete |
JJG 42-1987
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Standard similar to JJG 42-2023 JJG 134 JJG 86 JJF 042 Basic data | Standard ID | JJG 42-2023 (JJG42-2023) | | Description (Translated English) | Working Glass Hydrometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 48,468 | | Date of Issue | 2023-03-15 | | Date of Implementation | 2023-09-15 | | Issuing agency(ies) | State Administration for Market Regulation | JJG 42-2023: Working Glass Hydrometers---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.
National Metrology Verification Regulations of the People's Republic of China
JJG 42-2023
working glass float
Released on 2023-03-15
2023-09-15 Implementation
Released by the State Administration for Market Regulation
Verification rules for working glass buoyancy gauge
Replace JJG 42-2011
Responsible unit: National Quality and Density Measurement Technical Committee
Main drafting unit: China Institute of Metrology
Shanxi Institute of Metrology
Participating in the drafting unit: Yunnan Institute of Metrology and Testing Technology
Guangdong Institute of Metrology
Metrology and Verification Center of North China Company of China Aviation Fuel Co:, Ltd:
Yuyao Instrument No:2 Factory Co:, Ltd:
This regulation entrusts the National Quality and Density Measurement Technical Committee to be responsible for interpretation
The main drafters of this regulation:
Shi Wencai (National Institute of Metrology)
Gao Ping (Shanxi Institute of Metrology)
Participating drafters:
Zhang Jingyue (National Institute of Metrology)
Yang Lixian (Yunnan Institute of Metrology and Testing Technology)
Shen Youdi (Guangdong Institute of Metrology)
Rong Youzhan (North China Company Metrology and Verification Center of China Aviation Fuel Co:, Ltd:)
Ding Zhuyi (Yuyao Second Instrument Factory Co:, Ltd:)
Table of contents
Introduction (Ⅲ)
1 Scope(1)
2 References(1)
3 Terms and units of measurement(1)
3:1 Terminology(1)
3:2 Units of measurement(1)
4 Overview(1)
5 Metrological performance requirements (2)
6 General technical requirements (2)
6:1 Appearance(2)
6:2 Standard temperature(3)
7 Measuring Instrument Control(3)
7:1 Test conditions (3)
7:2 Verification items and verification methods (7)
7:3 Test result processing (11)
7:4 Verification cycle (11)
Appendix A (0~40)℃ pure water density table (excluding air) (12)
Appendix B Alcohol Solution Volume Fraction q and Density ρ Conversion Table at 20°C (14)
Appendix C Conversion table of sugar solution mass fraction p and density ρ at 20°C (15)
Appendix D Conversion Table of Milk Degree m° and Density ρ20 at 20°C (16)
Appendix E Conversion Table of Soil Degree s° and Density ρ20 at 20°C (17)
Appendix F Conversion Table of Baume Degree Bh and Density ρ20 at 20°C (18)
Appendix G Capillary Constant α of Liquids Denser Than Water (19)
Appendix H Surface Tension of Liquids Denser Than Water γ (21)
Appendix J Capillary Constant α of Liquids Denser Than Water (23)
Appendix K Surface Tension of Liquids Denser Than Water γ (26)
Appendix L Potassium Iodide, Mercury Iodide Aqueous Capillary Constant α and Surface Tension γ (29)
Appendix M Sugar solution capillary constant α (30)
Appendix N Surface Tension of Sugar Solutions γ (31)
Appendix P Air Density Calculation Formula (32)
Appendix Q Humid Air Density Table (34)
APPENDIX R CONVERSION RELATIONSHIP BETWEEN THE ASSUMPTED SCALE AND DENSITY OF SEVERAL WORKING GLASS FLOAT GAUGES (36)
Appendix S Verification Record Format of Working Glass Buoyometer Stem Diameter (37)
Appendix T Original Record Format of Density Verification by Static Weighing Method (38)
Appendix U Original Record Format of Density Verification by Direct Comparison Method (39)
Appendix V Format of the inner page of the verification certificate (40)
Appendix W Format of the inner page of the test result notification (41)
Introduction
JJF1002-2010 "Rules for Compilation of National Metrology Verification Regulations", JJF1229-2009 "Mass Density Measurement Name"
Terms and Definitions", ISO 649-2:1981 "General Density Meter for Laboratory Glassware - Part 2: Tests
"Methods and Use" together constitute the basic series of specifications supporting the formulation of this verification regulation:
This regulation combines the industry status and actual needs of my country's standard glass measuring instrument measurement, to JJG 42-2011 "Industrial
As Glass Buoymeter" has been revised: Compared with JJG 42-2011, except for editorial modifications, the main technical
The changes are as follows:
--- Increase the solid density standard as a measurement standard;
--- In the main supporting equipment and instruments section, the components used in the direct comparison method and hydrostatic weighing method are listed in detail
measuring instrument;
--- The verification method and data processing section increased the operation steps and calculation formula of the hydrostatic weighing method;
---Added Appendix H "Surface Tension γ of Liquids with Density Less Than Water";
--- Added Appendix K "Surface Tension γ of Liquids Denser Than Water";
--- Modified Appendix L, adding potassium iodide and mercury iodide aqueous solution surface tension;
--- Added Appendix N "Surface Tension of Sugar Solution γ";
--- Added Appendix S "Glass Buoyometer Stem Diameter Record Format";
---Modified Appendix T "Original Record Format of Density Verification by Static Weighing Method";
--- Added Appendix U "Direct Comparison Method Density Verification Original Record Format":
The previous releases of this regulation are as follows:
---JJG 42-2011;
---JJG 42-2001:
Verification rules for working glass buoyancy gauge
1 Scope
This regulation is applicable to quality fixation of density meters, oil density meters, alcohol meters, sugar meters, milk meters, soil meters, etc:
The initial verification, follow-up verification and in-use inspection of the type working glass float meter:
2 References
This procedure references the following documents:
JJG 2094 Density Measuring Instrument Verification System Table
JJF1229 Terms and Definitions of Mass Density Measurement
GB/T 17764 Structure and Calibration Principles of Density Meter
ISO 649-2 Density meter for general purpose laboratory glassware - Part 2: Test method and use (Labo-
use)
For dated references, only the dated version applies to this specification; for undated references
document, its latest version (including all amendments) applies to this specification:
3 Terminology and units of measurement
3:1 Terminology
3:1:1 Hydrostatic weighing method hydrostaticweighing
Based on Archimedes' law, by weighing the buoyancy of the glass buoy meter immersed in the liquid in a steady state
To determine the volume of its submerged part, and calculate the density value of the point of the glass float meter:
3:2 Units of measurement
The unit of density is kg/m3 or g/cm3:
The unit of the volume fraction of the alcohol solution is % (at 20°C, see the conversion table of the volume fraction q of the alcohol solution and the density ρ
Appendix B):
The unit of sugar solution mass fraction is % (see Appendix C for conversion table of sugar solution mass fraction p and density ρ at 20°C):
The unit of milk degree is m° (for the conversion table of milk degree and ρ20, see Appendix D, and for the conversion formula, see Appendix R):
The unit of soil degree is s° (see Appendix E for the conversion table of soil degree and ρ20, and Appendix R for the conversion formula):
The unit of Baume degree is Bh (for the conversion table of Baume degree and ρ20, please refer to Appendix F, and for the conversion formula, please refer to Appendix R):
4 Overview
The glass float gauge is a kind of glass that can float vertically and freely in the liquid, and can directly measure the liquid by its submerged depth in the liquid:
An instrument for bulk density, relative density or solution concentration, the structure of which is shown in Figure 1:
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