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CALIBRATION
The formula below gives the relationship between swath (i.e. band) width, flow rate,
walking speed and total spray volume:
Flow rate (ml/min) = 6 x total spray volume (l/ha) x walking speed (m/s) x band width (m)
To help calibrate the HERBIFLEX-4 a calculator disc is provided with the sprayer.
This is used as below:
1. Decide the total spray volume application rate to be used. A CDA rate may be in-
dicated on the label of the product. If not, as a general guide, use 10 l/ha (total spray
volume) for glyphosate and 20 l/ha (total spray volume) for other herbicides.
2. Decide the swath (band) width you
wish to use (e.g. 30 cm) and set the angle
of the head accordingly (see 'BEFORE
SPRAYING FOR THE FIRST TIME').
4. Having fixed the swath (band) width
and volume application rate select the
preferred walking speed (2km/hr = Slow,
3km/hr = Medium, 4 km/hr = Fast) N.B.
1 m/s = 3.6 km/hr.
Unless using the atomiser cone housing B120 for wider swaths (see 'OPTIONAL
EXTRAS') the flow rate used should not exceed 45 ml/min
3. On the calculator disc align the swath
(band) width (in cm) with the total vol-
ume application rate (e.g. 20 l/ha) as de-
termined in 1. above.
5. Read off the feed rate required to give
the correct volume application rate. (e.g.
30 ml/min with 30 cm swath (band)
width and walking speed of 3 km/hr to
apply at a volume of 20 l/ha).
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