Photoelectric spot-type detectors operate using the ______ concept.

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Multiple Choice

Photoelectric spot-type detectors operate using the ______ concept.

Explanation:
Photoelectric spot-type detectors rely on light scattering to sense smoke. In these detectors, a light source sends a beam into a sensing chamber; when smoke is present, the particles scatter light, and some of that scattered light reaches a photodetector, producing a signal that trips the alarm. This is different from ionization detectors, which use a radioactive source to ionize air and detect changes in current, or from thermal detectors that respond to heat. Absorption isn’t the primary mechanism driving this device.

Photoelectric spot-type detectors rely on light scattering to sense smoke. In these detectors, a light source sends a beam into a sensing chamber; when smoke is present, the particles scatter light, and some of that scattered light reaches a photodetector, producing a signal that trips the alarm. This is different from ionization detectors, which use a radioactive source to ionize air and detect changes in current, or from thermal detectors that respond to heat. Absorption isn’t the primary mechanism driving this device.

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