Cooper CAP320 Intelligent Addressable Optical Smoke Sensor (MAP820 / FXN723). These ranges of intelligent addressable sensors have been specifically designed to operate with Cooper intelligent addressable fire systems. All sensors are the third party approved to the relevant section of EN54 (part 7 for smoke detectors & part 5 for heat detectors). The optical sensor (CAP320) is suitable for most applications giving the fastest response to slow-burning or smoldering fires which give rise to large visible smoke particles.