AD365/-IV and AD365A/-IV are plug-in addressable multi-criteria detectors that combine photoelectric, thermal, and infrared (PTIR) sensors in one unit to sense multiple components of a fire. This approach enables enhanced sensitivity to real fire with heightened immunity to nuisance particulates.Multiple sensors and communication can greatly reduce nuisance alarms compared to single sensing methods. Sophisticated algorithms maximize the advantages of the sensor types. This detection strategy offers heightened immunity to nuisance particulates and enhanced sensitivity to real fire. Photoelectric sensors detect airborne particles associated with smoke. Thermal sensors detect heat and rate-of-rise (135°F fixed temperature threshold). The Infrared sensor discerns light patterns in the environment as an additional data point for alarm determination. This ability to reject certain nuisance alarm triggers, such as theater smoke, supports the use of the detector in applications where moderate to heavy nuisance conditions exist that might cause single sensing detectors to trigger a false alarm.The PTIR detector meets both UL 268 and UL 521 listing requirements and can indicate distinct smoke and heat alarms. This dual nature supports a local alarm setting for photoelectric detection and a general evacuation setting based on thermal detection. This can minimize work interruptions in multi-level buildings.Features Multi-criteria detection UL 268 and UL 521 Listed New modern profile Analog communications Low standby current Rotary address switches Dual LEDs for 360° visibility Expanded color options LiteSpeed® protocol support on all models; LiteSpeed and CLIP protocol support on -IV models