When smoke particles disrupt the light beam, the sensor sets off the alarm ... $33.98 at Lowe's “Both types of alarms are designed to alert people to fire in time to get out safely,” McKelvey ...

Detector upgrades of this kind are ... which de-excite by emitting near-ultraviolet light within few nanoseconds. A second type of fluor is often added to the polymer to shift the wavelength ...

The Power HyD detector family comprises three types of detectors—Power HyD S ... These detectors, combined with a light path optimized for the extended spectral range and laser excitation ...