The Linear Heat Detector is a proprietary cable that detects heat at any point along its length.

The sensor cable consists of two steel conductors individually insulated with a temperature-sensitive polymer. The insulated conductors are twisted together to create a spring pressure, then wrapped with an outer sheath suitable for the environment in which the detector is to be installed.

At the calibrated temperature, the heat-sensitive insulating polymer yields against the pressure generated by the heat radiation, allowing the inner conductors to contact each other and trigger an alarm signal. This action occurs at any heated point within the length of the detector cable. No specific length is required to be heated to activate the alarm, nor is the system required to be calibrated to compensate for changes in the ambient temperature where it is installed.

The Linear Heat Detector provides the advantages of line coverage with specific point sensitivity.