Overview
ISO 17962:2015 - "Agricultural machinery - Equipment for sowing - Minimization of the environmental effects of fan exhaust from pneumatic systems" provides design principles and test methods to reduce environmental release of seed-coating dust from vacuum‑style sowing equipment. The standard addresses situations where fugitive “dust off” from coated seeds can be entrained into pneumatic fan (blower) intake air and exhausted to the atmosphere. It defines limits, measurement methods and acceptance criteria to control drift from fan exhaust.
Key topics and technical requirements
- Scope & applicability
- Applies to vacuum‑style sowing systems used for sowing coated seeds where dust can mix with fan intake air.
- Not applicable to certain conveyance systems (central tank → remote meters with local exhaust; meter at central tank with ground‑exhaust) or equipment manufactured before publication.
- Design principles
- Fan exhaust outlet height: ≤ 0.5 m above ground in sowing mode; ≤ 1.5 m when turning (headland) mode.
- Air velocity limits (verification): exhaust stream external to a 2 m radius cylinder must not exceed 2 m/s (at specified heights); cylinder sides up to 0.25 m height ≤ 4 m/s.
- Test method & setup
- Sowing with undressed field (dent) maize seeds (2 500–4 000 seeds/kg) at 60 000–80 000 seeds/ha.
- Tracer test using fluorescent powder fed into fan inlet (minimum feed 150 mg/s ±10% per fan) while sowing; typical forward speed 6 km/h (default if manufacturer speed not given).
- Measuring area with ground collectors (e.g., Petri dishes) placed per standard layout; wind speed during test 1–5 m/s, mean direction within 30° of perpendicular to driving.
- Instrumentation: anemometer (head 45–90 mm, range 0.5–20 m/s, accuracy ±2%).
- Acceptance criteria
- Maximum permissible drift: mean sedimented tracer ≤ 1.5% of the applied tracer powder (calculated from 90 measured values across repetitions).
- Reporting
- Test reports must include equipment details, air outlet arrangement, weather data, measured tracer values and calculated percent drift.
Practical applications
- Helps manufacturers design vacuum‑style sowing equipment that minimizes environmental drift of seed coating dust.
- Enables test laboratories and certification bodies to verify compliance using standardized tracer tests and airflow measurements.
- Assists regulatory agencies and farm safety teams in assessing environmental and occupational exposure risks from pneumatic sowing systems.
- Useful for product development, conformity assessment, and risk mitigation programs focused on agricultural machinery emissions.
Who should use this standard
- Agricultural machinery manufacturers and design engineers
- Test & certification laboratories
- Regulatory authorities and compliance officers
- Agricultural extension services and large farm operators concerned with field emission control
Related standards
- ISO 17962:2015 was prepared by ISO/TC 23 (Tractors and machinery for agriculture and forestry). Consult national regulations and other ISO/TC 23 standards for complementary safety and performance requirements.