A photoelectric beam-type smoke detector is mainly used in areas such as __________.

A photoelectric beam-type smoke detector is mainly used in areas such as __________.

• A. Bathrooms
• B. Small offices
• C. Basements
• D. Hotel or mall atriums

Answer: (D)

Photoelectric beam-type detectors are designed for large, open spaces with high ceilings where smoke can travel a long distance before reaching a detector. A transmitter and receiver are set up across the space to create a beam; when smoke crosses that beam, light is scattered or the beam is interrupted, triggering the alarm. This makes them ideal for hotel or mall atriums, where a single beam can monitor a vast, unobstructed area efficiently. In contrast, bathrooms are typically humid and prone to steam, which can cause false alarms; small offices don’t require long-range monitoring and are better served by point-type detectors; basements may present moisture, dust, or layout challenges that aren’t ideal for long, open-beam monitoring.

Photoelectric beam-type detectors are designed for large, open spaces with high ceilings where smoke can travel a long distance before reaching a detector. A transmitter and receiver are set up across the space to create a beam; when smoke crosses that beam, light is scattered or the beam is interrupted, triggering the alarm. This makes them ideal for hotel or mall atriums, where a single beam can monitor a vast, unobstructed area efficiently.

In contrast, bathrooms are typically humid and prone to steam, which can cause false alarms; small offices don’t require long-range monitoring and are better served by point-type detectors; basements may present moisture, dust, or layout challenges that aren’t ideal for long, open-beam monitoring.