32
Putting into operation
DB 534 02. 02
7.5.1 Spread rate check
The spread rate [g/m²] depends on:
• the shutter position.
• the operational speed.
• the PTO shaft rev. speed.
• condition of spreading material (granular,
coarse/fine, moist, dry).
A spread rate check is recommended with any
change of spreading material or when it changed
its condition.
If the operational speed of the towing vehicle is
known a stationary spread rate is possible.
1. How to determine the actual speed of
operation
- Carefully measure a test distance of 100 m. Mark
beginning and end of the test distance.
- Drive test distance from beginning to end mark
with the intended, constant operational speed.
Determine the required time with the aid of a
stopwatch.
e.g. 100m in 120 sec.
-
Determine the operational speed [km/h].
Operational speed
[km/h]
=
360
time for 100m
Example: 100 m in 120 sec.
360
120 sec
= 3 km/h
2. Determining the required spread rate per
minute [g/min] for the desired spread rate:
So [g/min] = St [g/m²] x Fl [m²/min]
So: required spread rate
St: desired spread rate
Fl: area efficiency
Fl [m²/min] = W [m/min] x A [m]
Fl: Area efficiency
W: Travelled distance
A: Working width
W [m/min] =
F [m/h]
60
W: Travelled distance
F: Operational speed
Example:
Operational speed F: 3 km/h
Working width A: 4m
desired spread rate St: 50 g/m²
required spread rate So:? [g/min]
W
=
3000 [m/h]
60
= 50 m/min
F = 50 m/min x 4m = 200 m²/min
So = 50 g/m² x 200 m²/min
So = 10000 g/min
The necessary required spread is 10 kg/min.
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