Portafill 4000T, Руководство пользователя

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4 0 0 0 T
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2.5 Sound Pressure Levels
The noise measurements were obtained using
type 1 instrumentation that was calibrated
before and after use. Noise measurements
were taken in free field conditions during dry,
calm conditions with low wind speeds. The
screener units were running normally and the
sound level meter was located at 1.6m above
ground level on level compacted ground. Measurements were taken at 1m and 5m
from each of the screener units. The ambient
noise levels were at least 10dB below the
measured noise levels when the plant was
running and did not influence the recorded
noise levels.
Recorded at 1m and 5m dBL
(A) 5min
(Not to
scale), Result noted below
2.5.1 Conclusions
The recorded noise levels represent the
sound pressure level at each location
recorded over a five minute period. The
Cirrus type 1 Sound level meter and calibrator
are within factory calibration and the sound level meter was calibrated before and after
the series of measurements. There were no
other significant noise sources in the area
such as loading shovels or conveyors that
influenced the result.
75.3
84.5
81.4
81.5
81.1
84.2
83.0
78.4
85.1
86.9
88.1
83.9
84.1
87.6