Calculating Required Quantity Of Solution - Stihl SR 420 Instruction Manual

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8.3 As Soon as Engine Runs
2
► Move setting lever (2) to lower stop – the
engine settles down to idle speed.
8.4 Stopping the Engine
► Move the stop switch (1) to $
8.5 Other Hints on Starting
8.5.1 At very low outside temperatures
► Warm up the engine.
As soon as the engine runs:
► Move setting lever to lower stop – the engine
settles down to idle speed.
► Open throttle slightly – warm up the engine for
a short period.
8.5.2 If engine does not start
If you did not turn the choke knob to e quickly
enough after the engine began to fire, the com‐
bustion chamber is flooded.
► Remove the spark plug – see "Spark Plug".
► Dry the spark plug.
► Open the throttle wide.
► Crank the engine several times with the starter
to clear the combustion chamber.
► Install the spark plug – see "Spark Plug".
► Slide the stop switch to # and set the choke
knob to e – even if the engine is cold.
► Now start the engine.
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9 Calculating Required Quantity of Solution

8.5.3 If fuel tank has been run completely
dry and then refueled
► Pull the starter rope several times to prime the
fuel system.
9 Calculating Required
Quantity of Solution
9.1
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
9.2 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
9.3 Determining quantity of solution
The quantity of solution required is calculated as
follows:
T x 100 = T
W B
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