What distinguishes projected beam-type detectors?

Projected beam-type detectors are distinct in that they are designed to operate effectively in environments where small angular movements may occur without compromising their functionality. These detectors work by projecting a beam of light between a transmitter and a receiver; when smoke or obstructing particles enter this path, it interrupts the beam and activates the alarm.

The ability to remain unaffected by small angular movements refers to the detector's inherent design to maintain a consistent detection capability even if the alignment is slightly altered, making them suitable for various applications including large spaces with potential movement. This characteristic reduces the risk of accidental activation due to minor changes in positioning or environmental conditions that might affect other detector types.

This stability is particularly beneficial in settings like warehouses or auditoriums where there can be shifting equipment or changing arrangements, ensuring that the detector maintains reliability over time.