VLV55|VLV65 - Volumetric flow controller
TECHNICAL DOCUMENTATION
VLV65 - flow generated noise - relative sound spectrum |
Construction subject to change
No return possible
Version: 2017-04-24 | Page 13
VLV65 - FLOW GENERATED NOISE - RELATIVE SOUND SPECTRUM
NW100
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-7 -8 -5 -2 -3 -12 -18 -25
NW125
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-9 -8 -5 -2 -3 -10 -17 -25
Size
160
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-7 -7 -3 -1 -4 -9 -17 -26
NW200
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-5 -3 0 -1 -6 -11 -18 -27
NW250
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-4 -2 1 -2 -6 -9 -16 -25
Size
315
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-1 0 1 -2 -5 -9 -16 -27
Differential pressure range: 0 - 300 Pa
Air velocity: 0.5 - 5.0 m/s
K
L
= correction value; relative sound power level, relative to L
WA
K
LW
= L
WA
+ {K
L
}
C A L C U L A T I O N E X A M P L E
VLV65 design data
NW 200 mm | V=545 m³/h |
p=100 Pa | L
WA
= 60 dB(A)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
-5 -3 0 -1 -6 -11 -18 -27
Sound values calculated according to formula
K
LW(relativ)
= L
WA
+ {K
L
}
gives
Hz 63 125 250 500 1000 2000 4000 8000
L
WA
60
60
60
60
60 60 60 60
K
L
-5
-3 0 -1 -6 -11 -18 -27
K
LW
55
57
60
59
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