Heat Detector | Alarmline LHD Systems
Types are available for virtually any environment. Alarmline is ideal for dirty, windy and dusty environments where point heat detection cannot be used. Typical applications include cable tunnels, conveyor belts, underground car parks, power generation, warehouses and floating roof fuel storage tanks.
Comprises a twin-conductor "switching" cable with temperature-sensitive insulation protected by a special sheath. It operates by melting of the insulation between the conductors at a pre-determined temperature.
This creates a short circuit which is detected by a simple electrical device, which in turn provides a fire alarm signal. Fault conditions are detected by continuous monitoring for an open circuit state.