What is a fog generator burglar alarm and how does it work?

A fog-generator alarm is considered one of the most effective protection systems not only for commercial premises but also for residential settings. This alarm system consists of a highly engineered device designed to prevent all types of break-ins.

Once the intruder’s presence is detected inside the premises, the fog-generator alarm emits a fog so thick and dense that it completely blocks visibility, effectively eliminating any chance of theft.

Thanks to its extremely rapid activation, the fog-generator alarm gives the burglar no escape: within seconds they are enveloped in an intense cloud of fog.

Inside the device is a special liquid which, as soon as the alarm is triggered, is transformed into a nebulized vapor. The fog-generator system comprises a boiler and a pump, both activated by an electronic control board.

After quickly reaching a temperature of over 350 °C, the unit instantly discharges the fog, saturating the environment and maintaining a dense barrier for several minutes.

A similar, yet distinct, device is the smoke alarm system, which releases smoke rather than vapor. This type of system is activated by detection sensors linked to a smoke reservoir: roughly five seconds after the trigger, smoke begins to emit. Within 10–15 seconds the room is completely filled, making any visibility impossible and leaving the intruder utterly disoriented.

Unlike video-surveillance systems, the fog- or smoke-based system acts in real time, hindering the intruder from the very first moment. Neither fog nor smoke is toxic or harmful; they serve purely as a deterrent, prompting thieves to flee immediately.

How the Fog-Generator Alarm Works

1. Detection
   Sensors identify an unauthorized presence inside the premises.

2. Boiler Activation
   The boiler rapidly heats up.

3. Liquid Release
   A sealed bag containing the fog-fluid opens.

4. Fog Emission
   A powerful blast of vapor is expelled through nozzles.

5. Rapid Saturation
   In about 5 seconds, the fog fills an average-sized room.

6. Zero Visibility
   The dense fog curtain reduces visibility to near zero.

7. Fog Persistence
   The impenetrable barrier lingers for at least 15–20 seconds.

The device even includes a backup battery, allowing it to operate if mains power fails.

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