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GB/T 43859-2024: Test method for performance of water activity meters
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| GB/T 43859-2024 | English | 279 |
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Test method for performance of water activity meters
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GB/T 43859-2024
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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
Table of Contents
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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