The DP721RTA is a multi-sensor detector (optical enhanced by heat) with field exchangeable optical chamber and local relay output facilities. This detector will automatically reset when the fire alarm condition has been removed. The detector uses a combination of detection criteria from both optical and heat sensors to determine whether there is cause of alarm in its area.
700 Series detectors continually monitor their own sensitivity and operational status. Once a day they perform a full diagnostic test that includes dynamically testing the sensing chamber and internal electronics.