ISO 16122-4:2024

Overview

ISO 16122-4:2024 - "Agricultural and forestry machinery - Inspection of sprayers in use - Part 4: Fixed and semi-mobile sprayers" is the 2024 international standard that specifies requirements and test methods for inspecting fixed and semi‑mobile sprayers while they are in service. Used together with ISO 16122-1:2024 (which covers inspector protection), this standard focuses on the sprayer’s condition as it relates to environmental risk and its ability to achieve good application performance.

Key topics and requirements

The standard defines inspection criteria and verification methods across the sprayer system. Major technical topics include:

• Leaks and dripping - static and dynamic leaks and spray/drip on components.
• Pumps - capacity tests, pulsation assessment and air‑chamber checks.
• Spray mix agitation - hydraulic and mechanical agitation verification.
• Spray tanks - lids, strainers, pressure compensation, level indicators, filling and emptying, induction hoppers, container cleaning devices.
• Measuring, control and regulation systems - pressure indicators, flow meters, direct injection systems and pressure‑adjusting devices.
• Lines, hoses and filters - integrity, presence of filters, isolating devices and changeability.
• Application units - nozzles, horizontal and vertical booms, spray guns/lances; dripping and distribution uniformity checks.
• Distribution and uniformity - nozzle output, transverse and optional vertical distribution assessments (patternator use and coefficient of variation calculation).
• Blowers and autonomous units - condition, adjustability, drive systems and travel‑speed checks for robots.
• Cleaning equipment - verification of onboard cleaning systems.

Test methods are specified for pump capacity and pulsation, pressure indicator verification, nozzle flow measurement (on‑machine or removed), flow meters, patternator testing for transverse distribution, pressure variation when sections are closed/off, and accuracy of direct injection systems.

Applications and users

ISO 16122-4:2024 is intended for practical use in:

• Inspection bodies and regulatory authorities performing in‑service compliance checks.
• Equipment manufacturers and OEMs for design validation and quality control.
• Service technicians and maintenance teams to diagnose performance and environmental risks.
• Farm and forestry managers to implement routine inspections and reduce spray drift, chemical losses and environmental contamination.
• Certification and audit professionals assessing sprayer condition and application accuracy.

Related standards

• ISO 16122-1:2024 - General requirements and inspector safety (mandatory companion document).
• Other parts of ISO 16122 series (where applicable) address different sprayer types and inspection contexts.

ISO 16122-4:2024 helps ensure safe, effective and environmentally responsible application of plant protection products by providing harmonized inspection criteria and test methods for fixed and semi‑mobile sprayers.