Linear heat detector.
The linear heat detector is a proprietary cable that detects heat at any point in its length.
The sensor cable consists of two individually insulated steel conductors with a temperature sensitive polymer. The insulated conductors are braided together to create a spring pressure, then wrapped with an outer cover suitable for the environment in which the detector is to be installed.
At the calibrated temperature, the heat-sensitive isolating polymer yields against the pressure generated by heat radiation, allowing the inner conductors to contact each other and activate an alarm signal. This action occurs at any heated point within the length of the detector cable. A specific length is not required to trigger the alarm, nor is the system needed 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.