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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 |
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Thermogravimetric Moisture Meters
| Valid |
JJG 658-2022
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| JJG 658-2010 | English | 919 |
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Verification regulation of thermogravimetric moisture meters
| Obsolete |
JJG 658-2010
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| JJG 658-1990 | English | 239 |
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Verification Regulation of Instruments for Measuring the Moisture Content of Grain with Baking Method
| Obsolete |
JJG 658-1990
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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.]
Table of contents
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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