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GB/T 45789-2025 English PDF

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GB/T 45789-2025: Crop protection equipment - Droplet-size spectra from atomizers - Measurement and classification
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Basic data

Standard ID GB/T 45789-2025 (GB/T45789-2025)
Description (Translated English) Crop protection equipment - Droplet-size spectra from atomizers - Measurement and classification
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B91
Classification of International Standard 65.060.40
Word Count Estimation 10,180
Date of Issue 2025-05-30
Date of Implementation 2025-09-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 45789-2025: Crop protection equipment - Droplet-size spectra from atomizers - Measurement and classification


---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 65.060.40 CCSB91 National Standard of the People's Republic of China Plant protection mechanical atomizer droplet spectrum Measurement and grading (ISO 25358.2018, IDT) Released on 2025-05-30 2025-09-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

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. This document is equivalent to ISO 25358.2018 "Measurement and classification of droplet spectra of mechanical atomizers for plant protection". 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 China Machinery Industry Federation. This document is under the jurisdiction of the National Agricultural Machinery Standardization Technical Committee (SAC/TC201). This document was drafted by. Shixia Holdings Co., Ltd., Suzhou Xinde Machinery Co., Ltd., Suzhou Zhiquan Agricultural Technology Co., Ltd., China Agricultural Mechanization Research Institute Group Co., Ltd., Taizhou Guangfeng Plastics Co., Ltd., Guizhou Mechanical and Electronic Products Quality Supervision and Inspection Institute of Agricultural Technology, National Agricultural Technology Extension Service Center, China Agricultural Machinery Society, China Agricultural University, Jiangsu Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs Agricultural Mechanization General Station, Rongtong Agricultural Development (Harbin) Co., Ltd. The main drafters of this document are. Li Lilong, Ding Chunyi, Zhao Jinxia, Zhou Haiyan, Chen Guanshun, Jin Chen, Zhang Tie, Gao Yuanyuan, Zhao Qing, Yang Yating, Liu Dongwei, Zhang Weijiang, Lü Xiaolan, Sun Xing, Yi Xiutang, Zhuang Tengfei, Zhu Yanmei, Zeng Aijun, Ma Lingjuan, Lü Shusheng, Jia Ru, Shang Delin, Pan Xiaocheng, Yang Chengliang and Pang Shuying.

Introduction

Measurement and classification of droplet spectra for the application of pesticides and other chemicals helps characterize the spray plume, thereby improving application effectiveness and spray drift. manage. Most atomizers will produce droplet spectra, which will vary under different operating conditions. Different laboratories and measurement systems will produce different absolute values for a given droplet size. The main reason for the difference is usually sampling results, dynamic size range capability, data handling and reporting. Some of these differences can be minimized by using appropriate sampling techniques. However, the absolute value of the droplet spectrum still has discrete differences between measurement systems, especially the spatial particle size distribution (at the sampling interval The particle size distribution of droplets within a given spatial volume without significant changes within a given time interval) and the temporal particle size distribution (the number of droplets passing through the sampling area within a given time interval) The droplet size distribution (counting each droplet and measuring the size) leads to sampling differences. This document uses standardized terminology to describe droplet spectra, including the use of reference streams to define reference types, in order to improve the compatibility of different measurement systems and implementations. The relative consistency between laboratories in the measurement and classification of droplet spectra. Each measuring device should use this document to determine the reference type that is appropriate for it (one set per measurement system and sampling method) and then use The measured plumes are classified using the same measurement and sampling procedures as the corresponding reference plumes. Reference curves based on instrumentation and sampling techniques cannot be used to classify fog plumes from different measurement sources. Droplet spectrum classification can also provide users with applicable information. Plant protection mechanical atomizer droplet spectrum Measurement and grading

1 Scope

This document specifies the measurement and classification procedures for droplet spectra of atomizers used for plant protection and provides a reference system for determining the categories of droplet spectra. Depending on their functional principle and specific setup, droplet size measurement systems may give different results. The method can compare the droplet spectrum of a measured quantity with the reference spectrum, and can also make a relative comparison of the droplet spectra obtained by different measurement systems.

2 Normative references

The contents of the following documents constitute 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. Note. GB/T 20085-2024 Vocabulary of plant protection machinery (ISO 5681.2020, MOD) ISO 5682-1 Mechanical spray equipment for crop protection - Part 1.Test methods for sprayer nozzles Note. GB/T 20183.1-2024 Mechanical spray equipment for plant protection Part 1.Test methods for sprayer nozzles (ISO 5682-1.2017, IDT)

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in ISO 5681 and the following apply. ISO and IEC maintain terminology databases used for standardization at the following URLs. 3.1 Droplet size class The range between two reference droplet spectra. 3.2 The droplet spectrum defining the boundary between two droplet size classes (3.1) is measured by spraying a reference nozzle/pressure combination with filtered clean water. Clean water obtained. 3.3 Dv0.x The volume of the sampled droplets is accumulated in order of droplet size, and the cumulative value is the droplet diameter corresponding to 0.x of the total volume of the sampled droplets. 3.4 volume median diameter volumemediandiameter The volume of the sampled droplets is accumulated in order of droplet size, and the cumulative value is the droplet diameter corresponding to 50% of the total volume of the sampled droplets.

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