Klaxon GP12 Benutzerhandbuch

 

Installation 
 
a. 

Fix siren to a firm level base at a minimum height of 3m above the ground and free 
of side or top obstructions. 

 
b. 

For best all round sound propagation mount the unit at a height of 4.5 to 6m with 
50m clear radius all round. 

 

c. 

Figure 1 overleaf shows a polar plot of the sound output from the sirens in free 
space.

 

 
Please note that the propagation of sound in air is affected by the following factors 
which must be accounted for when calculating the coverage of the siren: 

 

•  Variations of the propagation speed in the air 
•  Attenuation of the sound during propagation 
•  Wind and turbulence of the atmosphere 
•  Obstacles placed in the vicinity of siren and listener. 
•  Ambient noise levels 

  

d. 

The plot assumes ideal free-field conditions.  

 

The following losses must be taken into account during commissioning: 
 

•  Sound attenuation loss over distance in free-field conditions without obstructions. 

 

Distance in Metres 

1 

30 

100 

200 

500 

1000 

2000 

GP6 135 105  95  89 

81 

75 

69 

GP10 140 110 100  94 

86 

80 

74 

Audibility 

dB(A) 

GP12 145 115 105  99 

91 

85 

79 

 

•  Attenuation in decibels per kilometre due to absorption of sound in air (10°C, 

90%RH). 

 

At 500 Hz frequency the attenuation is 1.6 dB(A)/kilometre 

 

•  Absorption due to fog in decibels per kilometre. 

 

At 500 Hz frequency the attenuation is 1.0 dB(A)/kilometre 

 

 

The two figures provided for sound absorption in clear air and fog are sound losses 

in addition to the typical sound losses experienced over distance indicated in the 
table above.