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GB/T 43859-2024 English PDF

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US$279.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 43859-2024: Test method for performance of water activity meters
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 43859-2024	279	Add to Cart	3 days	Test method for performance of water activity meters	Valid

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Basic data

Standard ID: GB/T 43859-2024 (GB/T43859-2024)
Description (Translated English): Test method for performance of water activity meters
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: N60
Classification of International Standard: 71.040.10
Word Count Estimation: 14,134
Date of Issue: 2024-04-25
Date of Implementation: 2024-04-25
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 43859-2024: Test method for performance of water activity 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.
ICS 71:040:10 CCSN60 National Standards of People's Republic of China Water activity meter performance test method Released on 2024-04-25 2024-04-25 implementation State Administration for Market Regulation The National Standardization Administration issued

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Overview 1 5 Test Conditions 2 5:1 Test Environment 2 5:2 Test standards and supporting equipment 2 5:3 Test reagents 2 6 Determination of performance indicators 2 6:1 General conditions for determination 2 6:2 Water activity indication error 2 6:3 Water activity measurement repeatability 2 6:4 Temperature indication error 3 6:5 Temperature fluctuations and control deviations 3 7 Notes 3 8 Test report 3 Appendix A (Normative) Preparation method of saturated sodium chloride solution 4 References 5

Foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting: Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents: This document was proposed by the Ministry of Science and Technology of the People's Republic of China: This document is under the jurisdiction of the National Technical Committee for Standardization of Instrumental Analysis and Testing (SAC/TC481): This document was drafted by: Guangzhou Institute of Metrology and Testing Technology, China Institute of Metrology, Shenzhen Guanya Moisture Meter Technology Co:, Ltd:, Sun Yat-sen University, Kangbao Zhixin Measurement Technology (Beijing) Co:, Ltd:, and Wuxi Huake Instrument Co:, Ltd: The main drafters of this document are: He Xin, Dai Hong, Li Zhanyuan, Tang Minran, Zhang Mingquan, Luo Xiaojin, Zhang Jungang, Tong Zhongjiang, Liang Zhijian, Tang Xiaojun: Water activity meter performance test method

1 Scope

This document describes a method for determining the performance of a water activity meter: This document is applicable to the determination of performance indicators of various water activity meters with temperature control function: The determination of activity meter performance indicators shall be carried out in accordance with this document:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document: For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document: GB/T 6682 Specifications and test methods for water used in analytical laboratories GB/T 13966 Terminology of analytical instruments GB/T 32267 Terminology for determination of performance of analytical instruments

3 Terms and definitions

The terms and definitions defined in GB/T 13966, GB/T 32267 and the following apply to this document: 3:1 Water activity The ratio of the water vapor partial pressure of the sample in a specified space to the saturated vapor pressure of pure water at the same temperature is expressed by formula (1): aw= p0 (1) Where: aw --- water activity; p --- the water vapor partial pressure of the sample under test when it reaches equilibrium in a closed container, in Pascals (Pa); p0 --- The saturated vapor pressure of pure water at the same temperature, in Pascals (Pa): [Source: GB/T 34790-2017, 3:1, modified] 3:2 When the moisture in a material has no exchange with the air or any surrounding substances, the adsorption and desorption of moisture reach equilibrium: Relative humidity value:

4 Overview

Water activity meter (also known as water activity meter, hereinafter referred to as instrument) usually adopts the principle of equilibrium relative humidity method: Equal to the relative humidity of the closed environment, the water activity of the sample is obtained by measuring the relative humidity in the closed environment: The sample to be tested is placed in a closed container, and water molecules are exchanged between the sample and the environment in the closed space to balance: ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 43859-2024_English be delivered?

Answer: Upon your order, we will start to translate GB/T 43859-2024_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 43859-2024_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 43859-2024_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.