In which fire alarm system used in an industrial installation, the detection method does NOT involve the presence of flame or smoke?

Fire alarm systems

A fire alarm system is a network of devices designed to detect and alert people about fire hazards. It helps in early fire detection and evacuation, preventing loss of life and property damage.

Fire alarm systems use different detection methods, most of which rely on sensing smoke, heat, or flames. However, electrical sensing is a detection method that does not involve the presence of flame or smoke. Instead, it works by detecting:

• Changes in electrical circuits due to overheating, short circuits, or faults.
• Current fluctuations in electrical equipment may indicate potential fire hazards.

Smoke-Based Detection Methods

• Obscuration Smoke Detector: Detects smoke by measuring how much light is blocked (e.g., beam detectors).
• Ionization Detector: Uses a small radioactive source to detect smoke particles from combustion.
• Light-Scattering Smoke Detector: Uses LED or laser beams to detect smoke particles in the air.