What indicates that a continuous-loop fire detector system is functioning correctly?

A continuous-loop fire detector system operates based on the principle that a change in the temperature affects the elements within the system. The indicator that the system is functioning correctly involves the integrity of these specific elements. If there are no broken elements, it confirms that the circuit is complete and the system can effectively detect temperature changes indicative of a fire.

The continuous-loop system typically comprises a sensing element that will change its electrical resistance in response to heat. If any part of this loop is broken or damaged, it can lead to a failure in detection, making the absence of broken elements a crucial indicator of proper functionality.

In contrast, while other options might seem relevant, they do not directly confirm the operational status of the system as effectively. For example, an indicator that is lit may not necessarily mean that the sensor is functioning correctly; it could simply indicate power without confirming proper detection capability. Similarly, low resistance could be a characteristic of normal operation but does not guarantee that the sensing elements are intact, and high current flow is not typically a desired operating condition in such systems. Hence, focusing on the integrity of the sensing elements provides a reliable indication of overall system function.