Flame detectors detect which light spectrums?

Flame detectors detect which light spectrums?

• A. Ultraviolet / Infrared
• B. Infrared / Ionization
• C. Ultraviolet / Ionization
• D. Heat / Infrared

Answer: (A)

Flame detectors sense the electromagnetic signals produced by a flame, primarily in the ultraviolet and infrared ranges. Ultraviolet radiation appears very quickly when combustion begins and is less common from non-flame sources in daylight, helping to reduce false alarms. Infrared radiation comes from the hot flame itself and can be detected even when there’s smoke or obscuring material. Using these two spectrums together makes flame detection faster and more reliable. The other options mix in ionization or general heat in ways that aren’t how flame detectors operate. Ionization refers to gas sensors that detect ionized particles from certain gases, not light emitted by flames. Heat or infrared alone lacks the rapid, flame-specific UV signal that many detectors rely on.

Flame detectors sense the electromagnetic signals produced by a flame, primarily in the ultraviolet and infrared ranges. Ultraviolet radiation appears very quickly when combustion begins and is less common from non-flame sources in daylight, helping to reduce false alarms. Infrared radiation comes from the hot flame itself and can be detected even when there’s smoke or obscuring material. Using these two spectrums together makes flame detection faster and more reliable.

The other options mix in ionization or general heat in ways that aren’t how flame detectors operate. Ionization refers to gas sensors that detect ionized particles from certain gases, not light emitted by flames. Heat or infrared alone lacks the rapid, flame-specific UV signal that many detectors rely on.