BS EN ISO 17962:2015 pdf download – Agricultural machinery — Equipment for sowing — Minimization of the en- vironmental effects of fan exhaust from pneumatic systems.
3 Requirements 3.1 General A means of minimizing the effects of fan exhaust from pneumatic systems shall be employed using either of the methods found in 3.2 and 3.3. The application of design principles is an acceptable means to minimize the effects of fan exhaust. Alternatively, testing methods can be used to verify conformance. 3.2 Principles of design method 3.2.1 Fan exhaust outlet 3.2.1.1 The height of the fan exhaust outlet above the ground plane shall be ≤0,5 m with the machine in the sowing mode. 3.2.1.2 The height of the fan exhaust outlet above the ground plane when changing direction in the turning (headland) mode shall be ≤1,5 m. 3.2.2? Fan?exhaust?system?verification 3.2.2.1 The equipment for sowing shall be set up per the manufacturer’s recommendations for the shape, size, and sowing rate of 60 000 seeds/ha to 80 000 seeds/ha of the field (dent) maize seed being used. 3.2.2.2 The seed metering device shall be loaded with field (dent) maize seeds (2 500 seeds/kg – 4 000 seeds/kg) as test material. 3.2.2.3 The maximum air velocity of the exhaust stream shall not exceed 2 m/s external to a 2 m radius cylinder centring on the fan outlet and extending from a height of 0,25 m above the ground plane to a cylinder height as defined by 3.2.2.5 and 3.2.2.6. The air velocity at the cylinder sides from the ground plane to 0,25 m height shall not exceed 4 m/s. For verification, eight (8) equally spaced measurements in the cylinder height range shall be made (see Figure 1).
3.2.2.4 When 2 m radius cylinders from separate exhaust outlets intended to operate simultaneously overlap, those overlapping cylinders shall be connected into a single ovoid shape with 2 m radius ends. Air speed measurements shall be taken with both exhaust outlets in operation. Air speed external to the ovoid shall not exceed limits specified for a single exhaust outlet. 3.2.2.5 The equipment for sowing shall be stationary and the ground plane shall be smooth, level, and unobstructed. The maximum ambient wind speed shall be ≤0,5 m/s. 3.2.2.6 The height of the air velocity measurement cylinder above the ground plane shall be ≤0,5 m with the machine in the sowing mode. 3.2.2.7 The height of the air velocity measurement cylinder above the ground plane when changing direction in the turning (headland) mode shall be ≤1,5 m. 3.2.2.8 The air velocity measurement device shall be an anemometer with a measurement head diameter of 45 mm to 90 mm, a minimum measurement range of 0,5 m/s to 20 m/s and an accuracy of ±2%. The specific volume of the ambient air during testing shall be 0,819 m 3 /kg to 0,894 m 3 /kg.