The 700 Series smoke detectors are the industry's first conventional self-diagnostic detectors specifically designed for the demands of commercial and industrial environments.

A pulsed infrared LED light source and a high-speed photodiode sensing element are housed in an omnidirectional sensing chamber which is protected by an insect screen. The chamber is not affected by ambient light. For easy cleaning, the chamber unsnaps and is field-replaceable.

The 721UT photoelectric smoke rate-of-rise heat detector includes fast response algorithms for a quick response to both flaming and smoldering fires. As soon as the heat sensor detects a rapid rise in temperature, the sensitivity of the photoelectric sensor increases.

The ESL ionization smoke detector is a single source, dual-chamber detector that provides excellent response to both visible and invisible combustion particles from all types of fires. The detector is exceptionally stable in all environments, including high altitudes and wind gusts. It also features an insect screen to protect further against nuisance alarms.