A projected beam smoke detector is useful in :

A projected beam smoke detector is useful in :

• A. Large atriums
• B. Small offices
• C. Bathrooms
• D. Corridors

Answer: (A)

Projected beam detectors are designed for large, open spaces with long distances between the transmitter and receiver. They place a beam across a wide, unobstructed area, and smoke entering that path interrupts the beam and triggers alarms. This setup works best in a large atrium where a single beam can monitor a long span instead of needing many individual sensors. In smaller spaces like offices or bathrooms, the long beam isn’t needed and humidity or steam can cause false alarms or affect performance, while corridors often have obstructions or drafts that reduce reliability. So a large atrium is the most suitable setting for a projected beam detector.

Projected beam detectors are designed for large, open spaces with long distances between the transmitter and receiver. They place a beam across a wide, unobstructed area, and smoke entering that path interrupts the beam and triggers alarms. This setup works best in a large atrium where a single beam can monitor a long span instead of needing many individual sensors. In smaller spaces like offices or bathrooms, the long beam isn’t needed and humidity or steam can cause false alarms or affect performance, while corridors often have obstructions or drafts that reduce reliability. So a large atrium is the most suitable setting for a projected beam detector.