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GP6, GP10 and GP12 Sirens

INSTALLATION AND MAINTENANCE

1. 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.

1 2 3 4

1
18-185845/4 2

Sommario

Pagina 1 -

GP6, GP10 and GP12 Sirens INSTALLATION AND MAINTENANCE 1. Installation a. Fix siren to a firm level base at a minimum height of 3m above

Pagina 2 - 18-185845/4

e. This equipment should only be connected to the supply voltage marked on the rating plate. f. WARNING: The equipment should be protected from acc

Pagina 3

GP6 and GP10 Single Ended Sirens - Polar Plot of Sound Output (dBA @ 1m)120125130135140145150015304560759010512013515016518019521022524025527028530031

Pagina 4

GP12 Double Ended Siren – Polar Plot of Sound Output (dbA @ 1m) 0 7590 60 15 30 45225 240 270 285 300 315330 345 255 210 19

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