Photoelectric Smoke Detector Head. The D265AW Photoelectric Smoke Detector detects the large smoke particles that typically result from wood, paper, and fabric combustion. Offices, warehouses, hotels and health care facilities are applications generally specified for photoelectric detectors. This detector has two components: the detector base and the detector head. The base is permanently attached and wired to a back box. The interchangeable heads quickly detach for replacement and cleaning without affecting circuit wiring. The D265AW Detector Head attaches to the D261AW Detector Base.