Calculating Required Quantity Of Solution - Stihl SR 200 Instruction Manual

11 Calculating Required Quantity of Solution

components (ignition, carburetor) from thermal
overload.
10.2 After Finishing Work
Storing for a short period: Wait for the engine to
cool down. Keep the machine in a dry place, well
away from sources of ignition, until you need it
again. For longer out-of-service periods – see
"Storing the Machine".
11 Calculating Required
Quantity of Solution
11.1
Determining surface area (m
In the case of ground crops, simply multiply the
length of the field by its width.
The surface area of high-growing plants is calcu‐
lated approximately by measuring the length of
the rows and the average height of the foliage.
The result is multiplied by the number of rows
and then by two if both sides have to be treated.
The surface area in hectares is obtained by
dividing the number of square meters by 10,000.
Example:
A field 120 meters long and 30 meters wide has
to be treated with a pesticide.
Area:
120 m x 30 m = 3,600 m
3,600 / 10,000 = 0.36 ha
11.2 Determining quantity of active
ingredient
Refer to the instructions supplied with the active
ingredient to determine:
– Required quantity of active ingredient for 1
hectare (ha).
– Concentration of active ingredient (mix ratio).
Multiply the required quantity of active ingredient
for 1 hectare by the area determined in hectares.
The result is the quantity of active ingredient
required for the area to be treated.
Example:
According to the maker's instructions, 0.4 liters of
active ingredient are required per hectare to
obtain a concentration of 0.1%.
Quantity of active ingredient:
0.4 (l/ha) x 0.36 (ha) = 0.144 l
0458-457-0121-C
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11.3 Determining quantity of solution
The quantity of solution required is calculated as
follows:
T x 100 = T
W
K
T = Quantity of active ingredient in liters
W
K K = Concentration in %
T = Required quantity of solution in liters
B
Example:
The calculated quantity of active ingredient is
)
0.144 liters. According to the maker's instruc‐
tions, the concentration is 0.1%.
Quantity of solution:
0.144 l x 100 = 144 l
0.1 %
11.4 Determining walking speed
Carry out a trial run with the machine fueled and
the container filled with water. Operate the spray
tube (swing it back and forth) as for the real run
described below. Determine the distance walked
in one minute.
Also use the trial run to check the selected work‐
ing width. The best working width for low-growing
crops is 4–5 m. Mark the working width with
stakes.
Dividing the distance walked in meters by the
time in minutes gives you the walking speed in
meters per minute (m/min).
Example:
The distance covered in one minute is 10
meters.
Walking speed:
10 m = 10 m/min
1 min
11.5 Determining discharge rate
The setting of the metering unit is calculated as
follows:
V (l) x v (m/min) x b(m)
a b
2
A (m )
V = Quantity of solution
a
v = Walking speed
b
V = Discharge rate
c
B
= V (l/min)
c
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