Which statement about flame detectors is correct?

The correct answer highlights the fact that infrared or ultraviolet light sources can indeed trigger a false alarm in flame detectors. Flame detectors are designed to sense the specific wavelengths of light emitted by flames, particularly in environments where fire monitoring is critical. However, other light sources, such as sunlight, welding torches, or even certain types of artificial lights, can sometimes emit similar wavelengths, leading to erroneous detection of a fire.

Understanding this characteristic is essential for fire safety professionals, as it underscores the importance of carefully selecting and positioning flame detectors to minimize the risk of false alarms. This consideration is crucial in various settings where flame detectors are employed, such as in industrial facilities, outdoor settings, and areas with multiple light sources. This context helps reinforce why the correct answer emphasizes the potential for false alarms triggered by infrared or ultraviolet light, guiding users in the effective deployment of flame detection systems.