ARAG Electriccontrol unit for crop-spraing application 871 User Manual
Page 19
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5.2
Calibrating the metered by-passes
These cocks safeguard the constant distribution of liquid even in case of operation with one or two
section valves closed.
Calibration must be carried out EACH TIME the type of nozzle is changed.
The metered by-pass calibration knobs are equipped with a graduated scale. Once each metered
by-pass has been calibrated, enter the value of the graduated scale for the type of nozzle in use in
the tables on page 20. This means that it will not be necessary to recalibrate a given metered by-
pass the next time the same nozzles are used, but simply set it to its value in the tables.
1
Close one section valve by setting its corresponding switch on the
control device to 'OFF'.
2
Adjust the corresponding compensation cock by turning the knob until
the pressure level is restored on the pressure gauge that was previously
set with all the section valves open.
3
Open and close the section valve (operate its switch on control device as
needed) and make sure that pressure value remains steady.
If pressure fluctuates, repeat the operations described at step
2
until no more fluctuation occurs.
CONTINUES