GB/T 21784.2-2008 English PDF

US$274.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21784.2-2008: Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21784.2-2008	274	Add to Cart	3 days	Laboratory glassware -- Hydrometer for general purpose -- Part 2: Test methods and use	Valid

Similar standards

GB/T 21617   GB 23350   GB/T 21622   GB/T 21796   GB/T 21765   GB/T 21764   

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

---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.
. 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 ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21784.2-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21784.2-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21784.2-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21784.2-2008_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.