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JJG 2094-2021 English PDF

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JJG 2094-2021: Verification Scheme of Measuring Instruments for Density
Status: Valid

JJG 2094: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 2094-2021	English	269	Add to Cart	3 days [Need to translate]	Verification Scheme of Measuring Instruments for Density	Valid	JJG 2094-2021
JJG 2094-2010	English	359	Add to Cart	3 days [Need to translate]	Verification scheme of measuring instruments for density	Obsolete	JJG 2094-2010

PDF similar to JJG 2094-2021

Standard similar to JJG 2094-2021

JJF 1943 GB/T 36126 GB/T 1885 JJF 1212 JJF 1261.10 JJF 1070

Basic data

Standard ID	JJG 2094-2021 (JJG2094-2021)
Description (Translated English)	Verification Scheme of Measuring Instruments for Density
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A53
Word Count Estimation	11,131
Issuing agency(ies)	State Administration for Market Regulation

JJG 2094-2021: Verification Scheme of Measuring Instruments for Density

---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 Scheme of Measuring Instruments for Density National Metrology Verification System of the People's Republic of China Density measuring instrument Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Density measuring instrument verification system table Replacing JJG 2094-2010 Focal Point. National Mass Density Measurement Technical Committee Main drafting unit. China Institute of Metrology Participating in the drafting unit. Shanghai Institute of Metrology and Testing Technology This regulation is entrusted to the National Mass Density Measurement Technical Committee to be responsible for the interpretation The main drafters of this regulation. Wang Jintao (China Institute of Metrology) Participating drafters. Chen Zhaohui (China Institute of Metrology) Shi Wencai (China Institute of Metrology) Emily Wen (Shanghai Institute of Metrology and Testing Technology)

Introduction (Ⅱ) 1 Scope(1) 2 Measurement standard(1) 3 Measurement Standards(1) 4 Work setting appliances (3) 5 Expanded uncertainty(5) 6 Block Diagram of Density Measuring Instrument Verification System (5)

Introduction

This verification system table is based on JJF1001-2011 "General Measurement Terms and Definitions", JJF1059.1-2012 "Testing Terms and Definitions" Evaluation and Representation of Uncertainty of Measurement", JJF1229-2009 "Terms and Definitions of Mass Density Measurement" and GB/T 17764-2008 Structure and Calibration Principles of Density Meters" as a reference, combined with the industry status of density measurement in my country According to the situation, the JJG 2094-2010 "Density Measuring Apparatus" has been revised. Compared with JJG 2094-2010, this verification system table, except for editorial modification, the main technical skills of this verification system table The changes are as follows. --- Added solid density standard; --- Added the traceability method of the hydrostatic weighing principle from various types of density meters to the solid density standard; --- Modified the density sub-datum; --- Modified the uncertainty range of the liquid density standard; --- Modified the traceability method of laboratory vibrating liquid density meter; --- Modified the traceability method of the online vibrating tube density meter; --- Modified the text expression of the range and grade of the weighing working digital densitometer; --- Modified the traceability method of weighing precision digital densitometer. Releases of previous versions of this verification system table. ---JJG 2094-2010. Density measuring instrument verification system table

1 Scope

This verification system table is suitable for the value transfer of density measuring instruments in the range of (650~3000)kg/m3.it It specifies the procedures and methods for transferring the value from the national reference of density to the working measuring instrument through the measurement standard, and gives the The corresponding expanded uncertainty or maximum allowable error. This verification system table is to ensure that the density measuring instruments meet the corresponding technical standards. Provide guidance on technical indicators and confirming their traceability.

2 Measurement basis

The density reference measuring instrument consists of a solid density reference and a solid density sub-reference. 2.1 Solid Density Benchmark The solid density reference mainly includes single crystal silicon ball, silicon ball diameter measuring device, and density reference value transmission device. solid The bulk density benchmark is established by the absolute measurement method, and its value is directly traceable to the mass and length of the basic international system of units. The unit is the highest basis for reproducing and unifying the national density value. The measurement range of the solid density reference is (500~ 10000) kg/m3, the relative expanded uncertainty is Urel=2×10-7, k=2.Solid Density Benchmark by Density Reference value transmission device, which transfers the density value to the sub-reference of solid density by the hydrostatic weighing method. Relative expanded uncertainty Urel= (4~6)×10-6, k=2. 2.2 Sub-reference of solid density The solid density sub-reference mainly includes single crystal silicon ball, single crystal silicon column, quartz ball, quartz column and density reference value transmission. delivery device. The measurement range of the solid density sub-reference is (650~3000) kg/m3, and its relative expanded uncertainty is Urel= (4~6)×10-6,k=2.The solid density sub-reference uses the density reference value transmission device to transfer the liquid static The force-weighing normal density measurement standard instrument transmits the density value, and the expanded uncertainty U= (1~ 3)×10-2kg/m3,k=2.

3 Measurement standard

Density standard measuring instruments are divided into three categories according to the measuring principle. The first type of glass float is based on Archimedes' law Meters, including the first-class standard density meter group, the second-class standard density meter group, the first-class standard alcohol meter group, and the second-class standard alcohol meter group group, second-class standard petroleum density meter group, first-class standard sugar meter group and first-class standard seawater meter group; the second class is based on harmonic On-line vibrating tube density standard device based on vibration principle; the third category is liquid density standard and solid based on stable standard material density standard. 3.1 First-class standard density meter group, second-class standard density meter group The first-class standard density meter group consists of 39 glass float meters (non-continuous type), and the measuring range is (650~ 2000) kg/m3.Among them (650~1500) kg/m3 density meter component value is 0.2kg/m3, its expansion is uncertain Degree U=8×10-2kg/m3, k=2.(1500~2000)kg/m3 Density meter composition value is 0.5kg/m3, Its expanded uncertainty is U=2×10-1kg/m3, k=2.In addition, the first-class standard density meter group adjacent float meter density The value is non-continuous, and for the convenience of use, the density meter can be equipped to realize the breakpoint measurement; the first-class standard density meter group uses the

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