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GB/T 21784.2-2008 English PDF

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GB/T 21784.2-2008: Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use
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GB/T 21784.2-2008English274 Add to Cart 3 days [Need to translate] Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use Valid GB/T 21784.2-2008

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Basic data

Standard ID GB/T 21784.2-2008 (GB/T21784.2-2008)
Description (Translated English) Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A80
Classification of International Standard 13.300
Word Count Estimation 14,132
Date of Issue 2008-05-12
Date of Implementation 2008-09-01
Quoted Standard ISO 91-1-1992; ISO 649-1-1981; ISO 650-1977; ISO 653-1980; ISO 654-1980; ISO 655-1980; ISO 656-1980; ISO 3507-1999; ISO 4788-2005
Adopted Standard ISO 649-2-1981, IDT
Regulation (derived from) Announcement of Newly Approved National Standards No. 7, 2008 (No. 120 overall)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the general type density meter test methods and use. ISO 649 Part 1 provides a general- density hydrometer procedures.

GB/T 21784.2-2008: Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use


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. Laboratory glassware Hydrometer for general purpose Part 2. Test methods and use ICS 13.300 A80 National Standards of People's Republic of China GB/T 21784.2-2008/ISO 649-2. 1981 Universal laboratory glassware densitometer Part 2. Test methods and use (ISO 649-2. 1981, IDT) Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 21784 "universal laboratory glassware densitometer" consists of two parts, corresponding to the expected structure and international standards are as follows. --- Part 1. Specification (ISO 649-1. 1981, IDT); --- Part 2. Test methods and use (ISO 649-2. 1981, IDT). This section GB/T 21784 Part 2. This part identical with ISO 649-2. 1981 "General laboratory glassware density meters - Part 2. Test methods and use." This part of the National Chemicals Management Standardization Technical Committee dangerous (SAC/TC251) and focal points. Drafting this Part. Guangdong Entry-Exit Inspection and Quarantine Hubei, China National Light Industry Product Quality Supervision and glass Testing Center, Beijing Arima Glass Technology Development Co., Ltd. The main drafters of this section. Xiaoda Hui, Lee Jun, Yuan Chunmei, Liu Yingfeng, ZHOU Ming-hui, Li Han, Zhong Zhiguang, Peng-speed standard, Zhaicui Ping, ZHENG Country, Guo Jian, Li Qingxiang, Yang Jingting. This section first release. GB/T 21784.2-2008/ISO 649-2. 1981 Universal laboratory glassware densitometer Part 2. Test methods and use

1 Scope

This section provides test methods and general purpose density meter. Part 1 ISO 649 protocols provide universal density hydrometer.

2 Normative references

The following documents contain provisions which, through reference GB/T 21784 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. ISO 91-1.1992 Petroleum Measurement Tables - Part 1. 15 ° F and 60 ° F as the reference temperature based table ISO 649-1. 1981 General laboratory glassware densitometer - Part 1. Specification ISO 650-1977 relative density of 60/60 ° F generic densitometer ISO 653-1980 precision thermometer with a long stick ISO 654-1980 precision thermometer with a rod ISO 655-1980 precision thermometer with a long internal standard ISO 656-1980 precision with short internal standard thermometer ISO 3507-1999 Laboratory glassware density bottles ISO 4788-2005 Laboratory glassware indexing cylinder

3 Universal densitometer method for density determination

3.1 General When using a specific density of time, in order to obtain the highest precision, should follow the following general procedure. 3.1.1 read density readings at a known temperature of the liquid. 3.1.2 the results of the readings were observed following amendments (obvious difference when). a) the meniscus height (if the test solution is opaque when, see 3.6.1); b) scale error observed readings (see 3.6.2); c) the standard deviation of temperature of the liquid density meter used (see 3.6.3); d) deviations and the surface tension of the liquid density meter nominal surface tension (see 3.6.4). 3.2 Instrument 3.2.1 densitometer Select the surface tension of the liquid sample to adapt densitometer. ISO 649-1 Table 3 gives the applicable type of liquid density meter Guidelines range. The surface tension of the liquid can be obtained from other special physical properties of materials form, such as "International Year of Physics, Chemistry, Technology often Number Table "(" InternationalCriticalTables "). 3.2.2 density meter container Select the density meter container Chapter 6. GB/T 21784.2-2008/ISO 649-2. 1981

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