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MICRONAIR AU8000 SPRAYER
Example:
Speed: 4 Km/Hour
Swath Width: 12 m
Therefore:
Area treated = S x W 4 x 12 = 0.08 ha/min
600 600
Table 1 shows the coverage of the sprayer for various swath widths and spraying
speeds.
4. Calculate the required output from the sprayer in litres/minute to give the correct
application rate for the chemical being used.
The output rate of chemical is given by the area sprayed (in hectares) per minute
multiplied by the required application rate in litres per hectare.
Example:
Coverage: 0.08 ha/min
Application rate: 2 litre/ha
Output = 0.08 x 2 = 0.16 litre/min
SWATH WIDTH (METRES) Speed
Km/hr
2 5 10 15 20 25 30 50
2
0.007 0.017 0.033 0.050 0.067 0.083 0.100 0.167
3
0.010 0.025 0.050 0.075 0.100 0.125 0.150 0.250
4
0.013 0.033 0.067 0.100 0.133 0.167 0.200 0.333
5
0.017 0.047 0.083 0.125 0.167 0.208 0.250 0.416
Table 1 – Coverage of Sprayer in Ha/min
5. Select the correct restrictor tube to give the required flow rate. Table 2 gives the
typical flow rate for each restrictor tube both with gravity feed and with the optional
boost pump operating. These figures are based on measurements with water. Actual
flow rates will depend upon the viscosity of the chemical being used. When the boost
pump is not used, the flow rate will also be affected by the height of the sprayhead
relative to the chemical tank. The rates in Table 2 are measured with the tank half full
and the sprayhead level with the engine.
FLOW RATE (LITRES/MINUTE) RESTRICTOR
NUMBER
Without boost pump With boost pump
1
0.075 0.40
2
0.150 0.80
3
0.300 1.60
4
0.600
5
1.200
Table 2 – Approximate Flow Rates for Restrictor Tubes