VLV55|VLV65 - Volumetric flow controller
TECHNICAL DOCUMENTATION
VLV55 - radiated noise - relative sound spectrum |
Construction subject to change
No return possible
Version: 2017-04-24 | Page 11
VLV55 - RADIATED 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
1 -1 -9 -8 -7 -5 -9 -11
NW125
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
4 2.4 -7 -3 -7 -7 -9 -14
Size
160
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
3 2 -3 -5 -6 -8 -9 -10
NW200
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-3 -4 -8 -6 -7 -6 -7 -9
NW250
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
2 0 -2 -5 -8 -6 -8 -11
Size
315
Relative sound spectrum (dB)
Correction value K
L
Frequency (Hz)
Hz
63 125 250 500 1000 2000 4000 8000
K
L
-3 -4 -2 -4 -8 -7 -7 -18
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
VLV55 design data
NW 160 mm | V=247 m³/h |
p=100 Pa | L
WA
= 34 dB(A)
Hz 63 125 250 500 1000 2000 4000 8000
K
L
3 2 -3
-5
-6 -8 -9 -10
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
34
34 34 34 34 34 34 34
K
L
3 2 -3 -5 -6 -8 -9 -10
K
LW
37
36 31 29 28 26 25 24
