Which statement is true of flame detectors?

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Multiple Choice

Which statement is true of flame detectors?

Flame detectors sense the radiant energy emitted by flames, typically at specific wavelengths in the ultraviolet or infrared range, and are designed to respond quickly to flame presence. Because their usefulness depends on detecting actual flame radiation rather than ordinary lighting, they’re placed in areas where other light sources are unlikely to produce signals that could be mistaken for fire. This placement helps minimize false alarms and ensures reliable, fast detection when a real flame appears. That’s why the statement about their typical placement is the best fit: in locations where other light sources are unlikely, the detector is less prone to false alarms and remains sensitive to true flame events. It isn’t accurate to claim they are unaffected by natural light such as sunlight—some flame detectors, especially certain UV types, can be influenced by sunlight if not properly filtered or shielded. And flame detectors generally respond faster to fire than many other detectors, not more slowly.

Flame detectors sense the radiant energy emitted by flames, typically at specific wavelengths in the ultraviolet or infrared range, and are designed to respond quickly to flame presence. Because their usefulness depends on detecting actual flame radiation rather than ordinary lighting, they’re placed in areas where other light sources are unlikely to produce signals that could be mistaken for fire. This placement helps minimize false alarms and ensures reliable, fast detection when a real flame appears.

That’s why the statement about their typical placement is the best fit: in locations where other light sources are unlikely, the detector is less prone to false alarms and remains sensitive to true flame events. It isn’t accurate to claim they are unaffected by natural light such as sunlight—some flame detectors, especially certain UV types, can be influenced by sunlight if not properly filtered or shielded. And flame detectors generally respond faster to fire than many other detectors, not more slowly.

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