EN ISO 28139:2021 PDF

Overview

EN ISO 28139:2021 (identical to ISO 28139:2019) specifies safety and environmental requirements and test methods for knapsack combustion engine-driven airblast sprayers used in crop protection. Published by CEN and prepared by ISO/TC 23, this standard covers design, construction, hazard elimination/reduction, verification tests, and minimum performance limits. It applies to equipment used as intended and under foreseeable conditions, and its requirements become mandatory for products manufactured 18 months after publication.

Key topics and technical requirements

The standard addresses all significant hazards except vibration transmitted to the operator’s back and contains detailed sections on:

• Safety requirements: stability in operation, protection from hot parts, fuel tank safety, power-driven components, harness and support, controls (throttle, engine stop, starting device), liquid shut-off valves, and electrical/ignition circuits.
• Environmental requirements: spray tank integrity, strainers/filters, droplet size and deposition under controlled conditions, absorbency of carrying straps, air/chemical hose integrity, fan performance, and residual liquid limits.
• Performance tests and methods: test liquids and equipment, engine speed conditions, spray liquid output, air velocity measurement, stability testing, filling rates, and mass of residual liquid.
• Human factors & information: required instruction handbook content, technical data, markings, safety warnings and signs, and documentation of safe working practices.
• Measurement topics: vibration and noise reduction at source, vibration measurement procedures, noise measurement, and electromagnetic immunity verification.
• Annexes: lists of significant hazards, sampling grids for air velocity, normative stability tests, example sprayer illustrations, and safety sign examples.

Practical applications and users

EN ISO 28139:2021 is essential for:

• Manufacturers and product designers developing knapsack combustion engine-driven airblast sprayers to meet safety and environmental compliance.
• Test laboratories and certification bodies performing conformity testing and type approvals.
• Regulators and procurement teams in agriculture and plant protection who specify compliant equipment.
• Occupational safety professionals and farm managers who evaluate equipment risk, safe use instructions, and environmental impact.
• Distributors and importers ensuring products meet European/CEN adoption requirements.

This standard helps reduce operator and environmental risk, ensures consistent droplet deposition testing for application efficacy, and supports regulatory compliance for crop protection equipment.

Related standards

• Supersedes EN ISO 28139:2009; text is the English adoption of ISO 28139:2019.
• Prepared by ISO/TC 23 (Tractors and machinery for agriculture and forestry) and CEN/TC 144.

Keywords: EN ISO 28139:2021, ISO 28139:2019, knapsack combustion engine-driven airblast sprayers, crop protection equipment, safety requirements, environmental requirements, test methods, CEN standard.