BS EN ISO 4254-6-2020 Agricultural machinery – Safety Part 6: Sprayers and liquid fertilizer distributors.
4.4.2 Powered height adjustment
In the case of powered height adjustment systems that are manually actuated, it shall be possible to actuate the manual control from the driver’s position and the control shall be of the hold-to-run type.
In the case of powered height adjustment systems that are automatically actuated, it shall be possible to override the system from the driver’s position.
To ensure the protection of the operator against crushing and shearing hazards related to a failure of the control circuit of the height adjustment of the boom, the machine shall be fitted for those purposes with either:
a) a device which limits the maximum downward speed of the boom to 10 mms-1 (measured at the centreline of the machine) during a hydraulic failure, or
b) a device capable of stopping the boom lowering at a minimum height of 500 mm between the boom and the ground.
For b), in those cases where the height needs to be reduced to less than 500 mm, a safety device shall prevent any lowering beneath 500 mm without an intentional and separate action of a safety device.
If these safety devices are hydraulic valves not directly fitted to the cylinder, the lines connecting the valve to the cylinder shall be designed to withstand a pressure of at least four times the rated maximum hydraulic pressure.
4.5 Spray tank
4.5.1 Prevention of whole-body access to the tank
To limit the risk of access into the tank, any tank opening greater than 400 mm in diameter — or, if it is rectangular, of more than 400 mm x 300 mm — shall be provided with a grating which can only be removed by the use of tools. The openings in the grating shall not exceed the above-mentioned dimensions. See also 1 g) and h) and 6.2.2.
4.5.2 Limitation of contact with chemicals To minimize the risk of exposure to chemicals during filling/cleaning operations 4.5.22. or shall be applied. Chemical induction bowls which are folded/unfolded manually shall be provided with a handle and locking mechanism for folding/unfolding that can be actuated without presenting a risk to the operator during operation, The handle can be an integral part of the chemical induction bowl provided it is suitably designed and clearly identified.
Power-assisted chemical induction bowls shall be able to be operated from a position that prevents the operator contacting the folding induction bowl while operating the folding control. The folding control shall be a hold-to-run control. The unintended unfolding of the chemical induction bowl during transport shall be prevented by a suitable means.
The plant protection product container rinsing device shall be operated by a hold’.torun control. The rinsing device shall operate after a container is correctly positioned on the rinsing device in a way that prevents the discharge of liquid onto the operator. The rinsed liquid shall be directed to release into the induction system so that no liquid shall be ejected outside of the induction system. The filling hole of the spray tank shall be so positioned that the height from the ground or platform Is not more than 1 300 mm, with the horizontal reach between the rim of the hole and the outer edge of any part of the sprayer which could hinder the operator being not more than 300 mm at the operator filling position (see Figure 1).BS EN ISO 4254-6 pdf download.