Environmental Engineering Reference
In-Depth Information
Fig. A.1. Drop-type spreader.
over the entire area. This process effectively eliminates skips in the
coverage.
Spreader calibration is the measurement of the output as the spreader
is operated over a known area, so as to determine what settings will
ensure the desired rate of application.
Calibrating a Drop Spreader
Follow these steps in order to calibrate a drop spreader (Fig. A.1):
1. Check the spreader to be certain that it functions properly.
2. Measure the width of the spreader opening and the circumference of
one of its wheels. For example, the spreader in Fig. A.1 is 60 cm wide,
and the wheels have a circumference of 1 m. Mark a wheel with a dot
to provide a starting point. When the wheel has been turned 10 times
(rolled 10 m), you know that the 60-cm-wide spreader has covered an
area of 6 m 2 (0.6 m
10 m).
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