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CALIBRATION
The work rate when using the ELECTRAFAN 110/240 will be dependent on the
particular situation. In glasshouses/polytunnels it will depend on the type of crop
being treated and the row spacing. In crops such as vegetables and flowers it will
generally take around 45 minutes to spray an area of 1,000m² (1/10 of a hectare). It
will often be necessary to spray crops from both sides of the row to ensure adequate
penetration and even coverage e.g. when foliage is dense, when the crop height
exceeds 0.75m or when planting beds are over 2m wide. As the objective is to apply
an even spray cover to all target surfaces it is very important for the operator to direct
the spray carefully at all areas to be treated e.g. if spraying a crop the ELECTRAFAN
110/240 should be moved gently up and down along the height of the crop (with the
machine held to the side and slightly behind the operator's direction of travel).
Practice spraying - without any spray mix in the bottle - to see what sort of walking
speed is practical.
The table below indicted the relationship between spray volume, flow rate and
walking speed for the ELECTRAFAN 110/240 as per the following formulae:
a)
Formula for calculating required flow rate:-
Flow rate = 6 x spray pass interval x total spray volume x walking speed
(ml/min)
b)
Formula to calculate the volume applied from a known flow rate:-
Measured flow rate (ml/min)
Area sprayed in one minute (m²)
The following table is a guide to liquid flow rates through various feed nozzles:
Feed nozzle
(orifice diameter marked
in mm on nozzle)
0.9
1.1 (fitted)
1.3
1.4
1.6
2.0
N.B. Liquid flow rates should always be measured with the actual spray mix.
Do not use flow rates over 110 ml/min.
(m)
x 10 = spray volume (l/ha)
Flow rate (ml/min)
Water
23
55
63
85
105
N/A
8
(l/ha)
Oil
(7mm²/sec viscosity)
18
40
46
50
56
77
(m/s)
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