horsch Leeb 4 AX, Operating Instructions Manual

Page: 148 / 161

HORSCH Leeb metering
cup
The Horsch Leeb metering cup is used to adjust
and check agricultural spraying implements. Be-
fore starting the measurement, the field sprayer
to be calibrated must be filled with clean water.
Now open the nozzles with the desired settings
for placing the crop protection agents. All noz-
zles should always be opened during setting or
checking.
Determining the placing quantity
in l/ha
To determine the placing quantity, the Horsch
Leeb metering cup is held under a spraying noz-
zle of the field sprayer for 30 seconds at 50 cm
nozzle spacing and for 60 seconds at 25 cm
nozzle spacing. The pump must be switched on
for the entire period and the placing quantity set
on the terminal must not be changed. Now place
the metering cup on a level surface. The fluid
level indicates the measured placing quantity at
different travel speeds.
The example shows: 150 l/ha at 12 km/h or
200 l/ha at 9 km/h etc.
¾
Placing quantity too high, lower spraying
pressure.
¾
Placing quantity too low, increase spraying
pressure.
Nozzle selection and control
The fluid level, which indicates the placing
quantity in l/ha on one side of the Horsch Leeb
metering cup, shows at the same time on the
other side of the measuring cup with which
nozzle size and at which spraying pressure this
placing quantity is reached.
¾
At a nozzle distance of 50 cm the respective
nozzle sizes can be read off directly.
¾
At a nozzle distance of 25 cm the respective
nozzle sizes must be halved.
Example: The previous fluid level indicates that
at 50 cm nozzle distance the desired placing
quantity of 150 l/ha is achieved at 12 km/h with
nozzle size 04 (red) at 2.7 bar or with nozzle
size 03 (blue) at 4.8 bar etc. Accordingly, with
a nozzle spacing of 25 cm, the placing quantity
of 150 l/ha at 12 km/h is achieved with nozzle
size 02 (yellow) at 2.7 bar or with nozzle size
015 (green) at 4.8 bar.
All values apply to water with a temperature of
15 °C and the pressure measured at the nozzle.
As a rule, the spraying pressure displayed at the
terminal is slightly higher, as pressure losses
occur between the fittings and nozzles.
142 MF