What principle operates the continuous-loop fire detector system sensor?

The continuous-loop fire detector system sensor operates based on the principle of core resistance material. In this type of system, a cable or wire containing a core material is used to detect increases in temperature. The core material's resistance changes in response to heat, which allows the system to identify a fire condition.

When the temperature rises beyond a preset limit, the resistance of the core material alters, triggering an alarm in the fire detection system. This method is effective because it continuously monitors an area for heat, providing timely alerts to potential fire hazards. The choice of core material is crucial, as it determines the sensitivity and response time of the detector.

Thermal expansion, mechanical pressure, and ultrasonic vibrations are not the principles behind the operation of continuous-loop fire detectors. Thermal expansion relates to the physical enlargement of materials when heated but does not directly translate to a change in electrical properties necessary for this sensing application. Mechanical pressure can be involved in other types of sensors but is not relevant here, while ultrasonic vibrations are typically used in different types of detection systems altogether.