TempestTM Sirens


The Tempest™ series of electro-mechanical sirens from American Signal Corporation cover four models from the Tempest-112 to the Tempest 135 AC/DC. This product line has its origins dating back to World War II in the wake of Pearl Harbor. ASC sirens were utilised to warn thousands of US servicemen and women, support personnel, and civilians.


Since the end of the war, tens of thousands of Tempest sirens have been deployed in all states of the US, and in 60 countries around the world. Installed across a broad range of military and government facilities, industries, and communities to provide mass notification to tens of millions of people, these are proven and respected sirens. The sirens in this series are omni-directional producing 3600 sound coverage of a number of selected warning tones only.


The Tempest Sirens are robust, dependable, low maintenance, and are a cost effective system ideally suited to warning communities for all types of natural and man-made disasters.


The range consists of the following models:

  • Tempest 112 – 110dB at 30m, 70dB at 1.2km
  • Tempest 121 – 121dB at 30m, 70dB at 1.6km
  • Tempest 128 – 129dB (+/- 2db) at 30m, 70dB at 2.4km
  • Tempest 135 AC/DC – 133dB (+/- 2db) at 30m, 70dB at 3.2km

The Tempest Series are expandable and extensible for example, the T-112 can be upgraded to the T-121 siren by adding additional horns.


  • Output Frequency: 500 Hz
  • Factory sealed motor bearings eliminate lubrication and maintenance.
  • Fibreglass hood, galvanized steel mounting platforms, and stainless steel hardware to minimize corrosion concerns.
  • Operating Temperature Range: -40 °C to 60 °C
  • Storage Temperature Range: -65 °C to 125 °C
  • Humidity 0% – 100% (non-condensing)
  • Wind Speed 150 MPH
  • 21 day battery backup duration
  • 60 minute run time, 3/3 duty cycle, for ASC electro-mechanical sirens
  • Optional 5 minute on / 5 minute off duty cycle
  • Options for solar, 240/120 VAC main power, UPS.

Applications for these sirens include:

  • Government
  • Military
  • Industry


  • Three tones (Alert, Attack, Fire) and a local growl test.




Growl Test


Visit the American Signal Corporation website.