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Stihl SR320 Manual

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Important:
All values must be inserted in the equation in the units spe-
cified. Note that hectares have to be multiplied by 10,000
to obtain square meters. Assuming a working width of 3 m
and a walking speed of 60 m/min, the calculation of the
above example would be as follows:
54 I • 60 m • 3 m
1 min • 3,600 m
2
= 2.7 I/min
The metering unit on the mistblower would therefore have
to be set to 2.7 I/min. It this rate is not marked directly on
the scale, select an intermediate setting. The settings of
the metering unit and the related discharge rates are given
in the mistblower's instruction manual. The following table
can also be used as a rough guide for selecting discharge
rates. If the required quantity of solution is not mentioned,
use the next higher and lower values in the table to work
out the correct proportions for your application. Similarly,
the table shows the quantities of solution required per hec
tare (acre) at different discharge rates and working widths.
They are based on a walking speed of 60 m/min.
Discharge
rate (I/min) Solution required at working width
1 m2 m3 m4 m
0.8 133 67 44 33
1.6 267 133 89 67
2.3 383 192 128 96
2.6 433 217 144 108
2.9 483 242 161 121
In our example the quantity of solution per hectare is 150
litres and the working width 3 m. In the "3 m" column, the
value 150 I is between 144 and 161 liters.
The difference between 150 and 161 is about twice as
much as it is between 150 and 144. The metering unit the
refore has to be set somewhere between 2.6 and 2.9. Allo
wing for the proportional difference, the setting should be
2.7, which corresponds to the calculated value.
The mistblower's discharge rate is also affected by the po
sition of the spray tube. The discharge rates quoted
above are averages for the "horizontal" and "30° up" posi
tions. There is a noticeable reduction in discharge rate
when the upward angle of the spray tube is increased, e. g.
mistblowing high trees. STIHL recommends the use of a
pressure pump (special accessory) for applications which
require the spray tube to be held at an upward angle of
more than 30°. It helps maintain a constant discharge rate
in all spray tube positions.
… 33 …


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