horsch Leeb 4 AX, Operating Instructions Manual

Page: 135 / 161

Calibrating the flow meter
The flow meter is calibrated by using the tank
method. A major amount of water is thereby
discharged from the spraying mixture container
over a certain period of time.
With the help of simulated travel speed and the
spraying duration the distance the machine will
travel can be calculated.
Distance = travel speed x spraying duration
Multiplied with the working width gives you the
area that would be processed when working with
the simulated travel speed and spraying time.
Processed area = distance x working width
You can then calculate the required amount of
spraying mixture and compare it with the actu-
ally used amount.
Required placing quantity =
processed area x placing quantity
The correction factor for the set pulses/100 l is
thereby determined. This is the required quan-
tity, divided by the actually applied quantity.
required quantity
placed quantity
Correction factor =
¾
The value is finally corrected under parameter
Main flow pulses and a new calibration is made
by using the new values.
For the crop protection sprayer the standard
value is 2,100 pulses/100 l.
Example:
The numerical values in the example were
randomly chosen and may differ from practice.
•
Machine with 36 m working width.
•
Setting on terminal: 2,100 pulses / 100 l
¾
Set 200 l / ha as placing quantity.
¾
Set 10 km/h as simulated travel speed.
¾
Note the filling level spraying mixture con -
tainer.
¾
Read the value under parameter Main flow
pulses (pulses/100 l) on the terminal and write
it down.
¾
Switch on the crop protection sprayer and run
it for 15 minutes.
The distance thereby is:
10 km/h x 0.25 h = 2,500 m
Multiplying this with the working width gives you
a processed area of:
2,500 m x 36 m = 90,000 m
2
= 9 ha
The product of this area and the set placing
quantity results in the required amount of spray-
ing mixture:
9 ha x 200 l/ha = 1,800 l
This value is now set into relation to the actually
placed quantity. The actually placed quantity is
the difference in filling level spraying mixture
container before and after calibration.
Here the actually placed quantity is: 1,850 l
The correction factor in this case is:
1,800 l
1,850 l
Correction factor = = 0.973
The placed quantity is too high, the value under
parameter 457 therefore needs to be corrected.
New value (pulses/100 l):
2,100 x 0.973 = 2,043
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