Beam smoke detectors are uniquely suited for protecting open areas with high ceilings where other methods of smoke detection are difficult to install and maintain. The beam of the detector senses a reduction in the signal of the unit, and works effectively on both smoky and fast-flaming fires.
Beam detectors come dual-ended and single-ended, with the single-ended beam detectors the easier to install. Alignment is accomplished through an optical sight and two-digit signal-strength meter incorporated into the unit.
The most basic unit consists of a transmitter/receiver unit and a reflector. When smoke enters the area between the unit and the reflector, it causes a reduction in the signal. If the smoke level reaches the predetermined threshold, the alarm is activated.
Other, more costly models have sensitivity adjustments and testing features.
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