Max Sound Level For Sounders

[dfree]

Can anyone tell me please what the maximum db level that is allowed for personal attack alarms. I don't know what standard this would come under but am just trying to find out the db limit. Thanks

[arfur mo]

Pardon?

112 db @ 1 metre i think, just springs to mind, don't quote me though.

i'd ring a manufacturer like Gardtec for the full national SP, but may also be affected by local by-laws where installed..

Arfur

[james.wilson]

Doubt its that low.

Do you mean the self contained battery ones or a system with buttons?

[arfur mo]

Doubt its that low.

Do you mean the self contained battery ones or a system with buttons?

Some of the sirens are I think rated at 110 db to be legally safe, public halls common for 90 db as refference for pa kit.

I fitted one lower rated siren to a blockboard facia in an entrance recess , old bond street. when tested it was simply eye watering, so location can also seriously impact on the sound pressures.

Arfur

[MrHappy]

states product is 140db ?

http://www.personalalarms.com/store/erol.html?1115x0#1115X1123

I doubt there is legal max ?

[arfur mo]

states product is 140db ?

http://www.personala...115x0#1115X1123

I doubt there is legal max ?

i'd be wary of that claim, i.e. those 12 volt tyre pumps which claim 250psi, lucky to get 15 in my experience

Arfur

[arfur mo]

risco new luminar\ siren is quoted at 114db

imho if there is no statut in force, then it comes down more to personal liability.

say youi got 140db @ 100 feet, then is go's off in a court yard and for some reason don't stop, you might find yourself being sued for 'enviormental and wanton assault of the hearing senses' whatever,

if a box of fairy cakes can win 20k then darn sure some ambulance chaser will be on to it to make dosh!.

Arfur

[hpotter]

we use klaxon prem rated 118dB @1m.

the 1 metre bit is important. can remember days when some manufacturers would put @ 3m, to pull the wool.

as for hand held, dunno. 140dB hand held is meaningless. dB is a ratio to a reference level. 50131 pt 4 gives very specific details of mounting bellboxes in order to measure acurately against that reference.

As for bellboxes 3dB increase approx = double sound at same distance though as above, its all relative.

[james.wilson]

Master blasters are 128

[hpotter]

Master blasters are 128

@1metre +/- 3dB