ARAG Electriccontrol unit for crop-spraing application 871 - Manual (Page 20)

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4 Calibrate ALL section valves before running a treatment; the calibration can be done as follows, depen-
ding on the configuration of the control unit:
• the number of nozzles is EQUAL for all section valves
you need only to calibrate one single valve, then set the graduated scales of all the others to the same
mark.
• the number of nozzles is DIFFERENT for each section valve
each section valve must be calibrated independently.
• the number of nozzles for each section valve is MIRRORED (Fig. 9):
you need to calibrate only one part of the control unit (right or left boom, valves
A, B, C): calibrate the
other part of the boom by setting the corresponding metered by-passes to match the valve settings on the
section of boom already calibrate (Fig. 9).
Fig. 9
If the types of nozzle are not changed, the adjustments made will safeguard a uni-
form distribution of liquid even when spraying needs differing levels of operating
pressure.