ISO 25358:2018 PDF

Crop protection equipment — Droplet-size spectra from atomizers — Measurement and classification

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Title (English):

ISO 25358:2018

Crop protection equipment — Droplet-size spectra from atomizers — Measurement and classification

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: July 10, 2018
Edition:: ISO IS 25358 edition 1 version 1
ICS:: 65.060.40

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Description (English):

This document specifies procedures for classifying droplet size spectra from atomizers used in spraying for crop protection. It provides a reference system for defining classes of droplet size spectra. Depending on their function principle and individual setup, measuring systems for droplet sizing can give different results. This document provides a means of comparing measured droplet size spectra to reference spectra and enables relative comparisons of droplet size spectra obtained from different measuring systems.

Technical details

Technical committee: ISO/TC 23/SC 6 - Equipment for crop protection
SKU: ISO 25358:2018

Abstract

Overview

ISO 25358:2018 - "Crop protection equipment - Droplet-size spectra from atomizers - Measurement and classification" specifies procedures for measuring and classifying droplet-size spectra produced by atomizers used in crop protection spraying. The standard provides a reference system of reference droplet size spectra (reference sprays and nozzle/pressure combinations) to enable relative comparison of results obtained from different measuring systems and laboratories.

Key topics and technical requirements

Scope: Classification of droplet size spectra using reference spectra; intended to harmonize terminology and relative comparisons across instruments.
Reference spectra and nozzles: Defines boundary spectra using specified reference nozzle/flow rate (pressure) combinations (see Table 1 in the standard - e.g., Mee Fog IP‑16 and various TeeJet models).
Measurement parameters reported: Characteristic diameters Dv0.1, Dv0.5 (volume median diameter), and Dv0.9 (10%, 50%, 90% cumulative volume points).
Sampling and measurement:
- Use at least three candidate atomizers from a batch of ≥10 with flow deviation ±3% of manufacturer rating.
- Representative cross‑sectional sampling of the spray plume at typically 30–50 cm from nozzle (or appropriate distance for full atomization).
- Recommended environmental conditions for inter‑laboratory comparison: spray liquid and air at (20 ± 2) °C, relative humidity 40–80%.
Instruments: Accepts non‑intrusive methods appropriate for the droplet size range and liquid (e.g., phase Doppler, laser diffraction, imaging, single‑particle counters). Instrument configuration and calibration must be verified.
Precision and calibration:
- Repeatability targets (example): maximum deviations between replicates for Dv0.5 of ±10%; laser diffraction replicates often required

Related standards

Other ISO standards

Overview

Key topics and technical requirements

Scope: Classification of droplet size spectra using reference spectra; intended to harmonize terminology and relative comparisons across instruments.
Reference spectra and nozzles: Defines boundary spectra using specified reference nozzle/flow rate (pressure) combinations (see Table 1 in the standard - e.g., Mee Fog IP‑16 and various TeeJet models).
Measurement parameters reported: Characteristic diameters Dv0.1, Dv0.5 (volume median diameter), and Dv0.9 (10%, 50%, 90% cumulative volume points).
Sampling and measurement:
- Use at least three candidate atomizers from a batch of ≥10 with flow deviation ±3% of manufacturer rating.
- Representative cross‑sectional sampling of the spray plume at typically 30–50 cm from nozzle (or appropriate distance for full atomization).
- Recommended environmental conditions for inter‑laboratory comparison: spray liquid and air at (20 ± 2) °C, relative humidity 40–80%.
Instruments: Accepts non‑intrusive methods appropriate for the droplet size range and liquid (e.g., phase Doppler, laser diffraction, imaging, single‑particle counters). Instrument configuration and calibration must be verified.
Precision and calibration:
- Repeatability targets (example): maximum deviations between replicates for Dv0.5 of ±10%; laser diffraction replicates often required

ISO 25358:2018 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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