horsch LEEB 4 LT, Operating Instructions Manual

Page: 145 / 162

12. Nozzle selection
NOTE
For the selection and use of nozzles you should
also follow the data and recommendations of the
respective nozzle manufacturer!
12.1 General
This chapter describes two possibilities for
determining the appropriate nozzles and their
characteristics as per ISO 10625.
NOTE
All application quantities (in l/ha) mentioned in
the spraying tables apply for water.
For liquid fertiliser these application quantities
must first be converted:
For conversion to ammonium nitrate - carbonyl
diamide solution multiply the application quantity
with 0.88.
For conversion to NP-solution multiply the ap-
plication quantity with 0.85.
H
2
O
x 0.88
x 1.14
NP-
solution
H
2
O
x 0.85
x 1.18
The diagram (a) serves the purpose of selecting
the suitable nozzle type .
The nozzle type is determined by
¾
the intended travel speed,
¾
the required application quantity
and
¾
the required atomizing characteristic (fine,
medium or large drops) of the crop protection
agent used for the crop protection measure
to be carried out.
The universal table (b) serves the purpose of
determining
¾
the
nozzle size
,
¾
the required
spraying pressure
and
¾
the required individual nozzle output for volu-
metric measurement of the crop protection
sprayer.
12.2 Procedure
¾
The tables apply for 50 cm nozzle spacing.
¾
Nozzle sizes and colour coding acc. to ISO
10625
12.2.1 With diagram and universal
table
1. Determine application quantity, travel speed
and atomizing characteristic.
2.
Nozzle type diagram (a):
Determine the operating point. The operat-
ing point is the intersection of travel speed
and application quantity.
3. Draw a vertical from the operating point
down.
4. Choose the suitable nozzle type for the re-
quired atomizing characteristic.
For this purpose follow the classification
in the left diagram (fine, medium, coarse
drops). Pay attention to the possible noz-
zle sizes.
Characteristics Universal table:
Change to the universal table for a more
accurate determination of the characteristic
values.
5. In the column with the determined applica-
tion quantity find the line with the determined
travel speed (if necessary use an approxi-
mate value).
6. In the right hand line read the nozzle output
and the suitable nozzle sizes with the as-
sociated pressure.
Example:
to 1. Application quantity: 200 l/ha
Travel speed: 8 km/h
Atomizing characteristic: coarse drops
to 2 / 3. See diagram (a)
to 4.
Nozzle type: ID/AL
possible nozzle types: -025 or -03
to 5. See universal table
to 6. Nozzle output: 1.35 l/min
Nozzles: Size 025 with 5.5 bar
Size 030 with 3.8 bar
Ammonium
nitrate -
carbonyl di-
amide solution
145