KUHN AXERA-M, Руководство оператора

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4. Calibration check
4.1 Calculating the mean application rate
To ensure accurate application rates we recommend that a new calibration check is
carried out each time a new type or different batch of fertilizer is used. Calibration
must be done when the machine is stationary with the PTO revolving at 540 rpm, or
according to spreading charts, depending on fertilizer, or when driving over a test
length.
Calculation of precise tractor forward speed:
For more precise measurement of tractor forward speed to that given by the tractor
meter, drive a measured 100m on a field with the hopper half full and measure the
time taken.
Tractor speeds outside the scale can be calculated using the following formular :
Tractor speed =
360
measured time for 100m
e.g.
360
36 secs
=
10 km/h
Determination of the required mean output per minute:
The calibration check is only carried out with one shutter outlet. However, the fertil-
izer quantity required is calculated for both shutter outlets i.e. total working width,
therefore the calculated quantity should be halved for calibration purposes.
Tractor speed (km/h) x working width (m) x application rate (kg/ha)
600
= kg/min
Example:
8 km/h x 18 m x 300 kg/ha
600
= 72 kg/min
Therefore,
36kg of fertilizer must flow through one shutter outlet in 60 secs . In or-
der to determine the correct metering slide setting, several attempts may be required.
(Use values provided in the spreading charts as a guideline).