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    PPI and POI emergency population warning sirens

Questions / Answers

PPI/POI industrial warning sirens

Frequently asked questions about the emergency population warning sirens:

The coverage radius is the main value to consider at the time to choose a siren. It is very important to know the size of the area to cover, as this information will be decisive to define the output efficiency of the siren. In addition, it is highly recommended to realize a case study to determine the number of sirens that need to be be installed as the relief and the configuration of the area to cover will be determinant.
Several types of triggers are normally used.
The simplest trigger remains the one from the control cabinet.
If you need to trigger your siren in a remote mode, you have the choice between:
  • A remote box connected by cables
  • A telephone transmitter (only 1 siren)
  • A connection to National Alert System
It is very important to know how many sirens should be triggered.
We offer others multi sirens trigger systems:
  • High-debit Radio system (from 1 to 6 sirens)
  • Secured digital radio system with command control system (form 1 to 256 sirens)
The alert of the population consists in delivering a signal, released by the authorities during an emergency phase, to warn the population of a imminent or current danger, that could affect their physical integrity and require a safe reflex behavior.
Thus, the warning was only deliver to make people behave safely, which simply means, get shelter from danger: evacuate or shelter in a building, waiting for further information.
The main difference is that the sirens, part of the National Alert System, are directly managed by the state or locals authorities – whether for the maintenance or the trigger – and industrial sirens (or PPI Sirens) are under the control of the private operator.
Interested by the installation of an emergency population warning siren?