It is a line-type form of fixed temperature heat detection used in commercial and industrial environments. This linear cable can detect a fire anywhere along its entire length and is available in multiple temperatures.
Linear Heat Detection (LHD) cable is essentially a two-core cable terminated by an end-of-line resistor (resistance varies with application). The two cores are separated by a polymer plastic, that is designed to melt at a specific temperature (commonly 68°C for building applications), which causes the two cores to short. This can be seen as a change in resistance in the wire.
The heat sensing cable, control module(interface unit), and terminal unit(EOL box).
The digital type (Switch type, Irrecoverable) and analogue type (Recoverable). The digital type is classified into three groups by applications, conventional type, CR/OD type and EP type.
Easy installation and maintenance
Minimal false alarms
Provides pre-alarm at every point on the cable especially in the harsh and hazardous environments.
Compatible with intelligent and conventional detection and fire alarm panels
Available in a variety of lengths, cable coatings and alarm temperatures for maximum flexibility.
Power generation and heavy industries
Oil & Gas, Petrochemical industries
Transportation: Road tunnels and access tunnels
Floating roof storage tank
Vehicle engine compartments
Unwanted alarms can occur when the cable is installed with an alarm rating to close to the ambient temperature. Therefore, always allow at least 20°C between maximum expected ambient temperature and alarm temperature.
Yes, the detector must be tested at least annually after installation or during use.