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JJG 658-2022 English PDF

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JJG 658-2022: Thermogravimetric Moisture Meters
Status: Valid

JJG 658: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 658-2022	English	509	Add to Cart	5 days [Need to translate]	Thermogravimetric Moisture Meters	Valid	JJG 658-2022
JJG 658-2010	English	919	Add to Cart	4 days [Need to translate]	Verification regulation of thermogravimetric moisture meters	Obsolete	JJG 658-2010
JJG 658-1990	English	239	Add to Cart	2 days [Need to translate]	Verification Regulation of Instruments for Measuring the Moisture Content of Grain with Baking Method	Obsolete	JJG 658-1990

Standard similar to JJG 658-2022

JJG 249 JJG 404 JJG 134

Basic data

Standard ID	JJG 658-2022 (JJG658-2022)
Description (Translated English)	Thermogravimetric Moisture Meters
Sector / Industry	Metrology & Measurement Industry Standard
Word Count Estimation	26,235
Date of Issue	2022-12-07
Date of Implementation	2023-06-07
Issuing agency(ies)	State Administration for Market Regulation

JJG 658-2022: Thermogravimetric Moisture 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.
National Metrology Verification Regulations of the People's Republic of China Drying Moisture Meter Released on 2022-12-07 2023-06-07 Implementation Released by the State Administration for Market Regulation Verification Regulations for Moisture Analyzer by Drying Method Replace JJG 658-2010 Responsible unit. National Mass Density Measurement Technical Committee Main drafting unit. Shanghai Institute of Metrology and Testing Technology China Institute of Metrology Participated in the drafting unit. Jiangxi Provincial Institute of Metrology and Testing Zhejiang Institute of Quality and Technical Supervision and Inspection Henan Institute of Metrology Mettler-Toledo Instruments (Shanghai) Co., Ltd. This regulation entrusts the National Mass Density Measurement Technical Committee to be responsible for interpretation The main drafter of the regulations. Su Yi (Shanghai Institute of Metrology and Testing Technology) Wu Di (National Institute of Metrology, China) Participating drafters. Zhu Jun (Shanghai Institute of Metrology and Testing Technology) Yang Qiqi (Jiangxi Provincial Institute of Metrology and Testing) Ge Rui (Zhejiang Institute of Quality and Technical Supervision and Inspection) He Kaiyu (Henan Institute of Metrology) Ji Chen[Mettler-Toledo Instruments (Shanghai) Co., Ltd.]

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 Terms and units of measurement(1) 3.1 Terminology(1) 3.2 Units of measurement(2) 4 Overview(2) 5 Metrological performance requirements (2) 5.1 Accuracy classes(2) 5.2 Actual division value d (3) 5.3 Verification division value e (3) 5.4 Maximum permissible error(3) 5.5 Weighing Indication Error(4) 5.6 Weighing Repeatability(4) 5.7 Moisture determination error (4) 5.8 Measurement performance requirements for weights equipped with analog indicating moisture analyzers (4) 5.9 Measurement performance requirements of the sample plate equipped with the analog indicating moisture analyzer (4) 6 General technical requirements (4) 6.1 Appearance requirements (4) 6.2 Normality requirements (5) 6.3 Operating temperature requirements (5) 6.4 Functional requirements (6) 6.5 Safety and reliability(6) 7 Measuring Instrument Control(8) 7.1 Test conditions (8) 7.2 Verification items (8) 7.3 Verification method (9) 7.4 Test result processing (12) 7.5 Verification cycle (12) Appendix A Preparation of Sodium Chloride Solution (13) Appendix B Verification Record Form of Analog Indicating Moisture Analyzer (15) Appendix C Calibration Record Form of Digital Moisture Analyzer (16) Appendix D Format of Inner Page of Calibration Certificate for Moisture Analyzer by Drying Method (17) Appendix E Inner Page Format of the Moisture Analyzer Verification Result Notification (18)

Introduction

This procedure is formulated according to the rules of JJF1002-2010 "Rules for Compilation of National Metrology Verification Regulations". The terminology used is based on JJF1229 "Terms and Definitions of Mass Density Measurement". The revised content is in the measurement performance requirements, The main technical indicators and other aspects refer to the international recommendation OIMLR76-1.2006 "Non-automatic weighing Instrument Part 1.Measurement and Technical Requirements Test", and OIMLR76-2.2006 "Non-automatic Weighing Instrument Part 2 Part. Relevant content of Test Report Format. The main contents of this revision are as follows. --- In "Referenced Documents", delete the year number of regulations and specifications; ---Change "water loss rate" to "water loss rate", add the term "water loss rate determination method", and add 1d/60s dehydration rate determination method; --- Change "weighing device" to "weighing device"; ---The calibration division value range of the special accuracy level moisture analyzer is modified to e≥1mg; --- Increase the minimum weighing requirements; ---Modified the expression of the verification division value e; --- Modified the definition of moisture determination error; ---Deleted power supply requirements, sodium chloride standard substance number; --- Increased the sodium chloride solution standard substance, and the mass fraction of the original ratio of sodium chloride solution and sodium chloride solution The mass fraction control requirements of standard substances are unified as U=0.03% (k=2); ---Modified the calculation formula of the moisture measurement error of the analog indicating moisture analyzer; --- Modify Appendix A "Preparation of Sodium Chloride Solution". The release status of previous versions of this regulation is as follows. ---JJG 658-2010; ---JJG 658-1990. Verification Regulations for Moisture Analyzer by Drying Method

1 Scope

This regulation is applicable to the first verification of the drying method moisture analyzer for the purpose of detecting the moisture content (the inspection after repair) as the first check), subsequent checks, and in-use checks. The drying method moisture analyzer is mainly for the physical form and chemical Samples with relatively stable morphology are used for the determination of moisture content.

2 References

This procedure references the following documents. JJG 98 mechanical balance JJG 99 Weights JJG 1036 electronic balance Preparation of GB/T 601 Chemical Reagent Standard Titration Solution GB/T 6682 Analytical laboratory water specifications and test methods OIMLR59.2006 (E) Grain and oilseed moisture meter [OIMLR59.2006 (E) Moisture OIMLR76.2006(E) (all parts) non-automatic weighing instruments [OIMLR76.2006(E) (alparts) For dated references, only the dated version applies to this regulation; for undated references document, its latest version (including all amendments) applies to this regulation.

3 Terminology and units of measurement

3.1 Terminology 3.1.1 Moisture content (content of moisture and volatile components) moisturecontent The ratio of the mass difference before and after drying of the sample to the mass of the sample before drying. Note. expressed as a percentage. Smallest increment of change in moisture content that can be displayed. Note. expressed as a percentage. 3.1.3 sample plate sampleplate A container for directly hosting the object under test. At the specified temperature, according to the set heating time or water loss rate, heat the tested sample of known mass, through A physical reaction that evaporates the water in the sample. By comparing the quality difference of the tested sample before and after heating, the measured sample moisture content of the product.

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