Photoelectric spot-type detectors operate using the ______ concept.

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the Special Hazards Systems Level 2 Test with our comprehensive resources. Use interactive flashcards and engaging multiple-choice questions, each with clues and detailed explanations. Boost your confidence and ace your test!

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.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy