Table of Contents
Advertisement
CALIBRATION
The workrate when using the ELECTRAFAN 12 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. The objective is to apply an even spray cover
to all target surfaces so it is very important for the operator to carefully direct the
spray at all areas to be treated e.g. if spraying a crop the ELECTRAFAN 12 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 indictes the relationship between spray volume, flow rate and
walking speed for the ELECTRAFAN 12 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
7
(l/ha)
Oil (7mm²/sec viscosity)
18
40
46
50
56
77
(m/s)
Advertisement
Table of Contents
