The Siren Board

Alasiren1977 wrote:Here is the same area showing them testing the decibels on a WPS-4004 and not getting the full 129dbc they should be:

http://video.aol.com/video-detail/torna ... 2806225773

*laughs* It's cute how she says "There are up to 16 speakers inside these tornado sirens" than points to a WPS-4004, which only has up to 4 speakers. Yes, I know Franklin County also has 3016's.

How comforting to know they can still operate with a burnt out driver, while being slightly quieter.

hat does ema stand for?

cyclonesthebest wrote:hat does ema stand for?

Emergency Management Agency

Edit:

Do you use a Macintosh by any chance with Leopard O/S? If so, they FINALLY released a patch for the "missing first letter" issue.

Is there a standard amount of time it takes to cool a siren? Im sure the mechanical ones take longer to cool then the electronic ones.

Alasiren1977 wrote:Is there a standard amount of time it takes to cool a siren? Im sure the mechanical ones take longer to cool then the electronic ones.

Good question. Modern continuous duty motors (such as sentry uses) employ a fan and cooling fins to cool the motor down while running. Older sirens, such as the 2T22, lack these features allowing the motor to get hot. When a motor gets to hot, the insulating resin in the motor breaks down allowing the windings to short circuit and blow up the motor. As for electronic sirens, even a small amount of heat can fry a driver, as all it takes is enough heat to melt a thin copper wire.

I find it puzzling that they say the Whelen is "fully operational" at 112db but they also said it was fully operational at 129db. In my book, 129 means fully operational not 112.

SirenMaster2000 wrote:I find it puzzling that they say the Whelen is "fully operational" at 112db but they also said it was fully operational at 129db. In my book, 129 means fully operational not 112.

That news test wasn't carried out in proper scientific method. It means nothing.

I have a question. Does an electronic siren need a "cool" down period after doing several P.A. announcements or is just when it is blasting the tone?

All of the sirens have been repaired and several new ones are being installed. I love how the reporters twist the information around making the EMA look bad. I am glad everything is fixed now though. Whelen did tell us that the sirens need a rest period but it is not in the manual. The sirens were not run constantly for the 60 min they would shut off for a second and then would start back up but the alert signal did not last the full 60 min. If it did all of the sirens would have failed.

We only run our sirens for five continuous minutes for tornado warnings then they shut off not to be sounded again. The only time I ever heard them go off twice for the same storm was when they had issued a severe thunderstorm warning then up-graded to a tornado warning. It seems unnecessary to run a siren for the duration of the warning. Media outlets tell you when the warning expires.