Photoelectric beam sensors use an active infrared beam between aligned devices to detect interruptions, making them suited to perimeter security and monitoring larger outdoor or open areas. Photoelectric smoke sensors detect smoke particles in the air, and some also monitor heat, making them suited to fire detection in residential and commercial spaces.

When choosing wired or wireless photoelectric sensors for an existing alarm system, check panel compatibility, available wiring, power requirements, communication method, mounting location, and whether the sensor provides smoke, heat, or perimeter beam detection. Wireless options can simplify installation in finished spaces, while wired sensors may fit systems with existing cable runs, but wireless models typically require compatible receivers or transceivers and battery maintenance.

Photoelectric sensors can be installed indoors on walls or ceilings for smoke detection, or outdoors for perimeter monitoring with photoelectric beam detection. Placement depends on the sensor type, required coverage, clear line of sight, mounting surface, and exposure to weather, sunlight, dust, or other environmental conditions.

When specifying photoelectric sensors, compare the sensing application, stated detection range, mounting environment, and installation features, such as alignment aids for outdoor beam detection or wall and ceiling mounting for smoke detection. Also review tamper protection, photoelectric smoke sensing, heat detection, built-in sounders, wireless communication, connected alarm notifications, battery life, and self-diagnostics to match the sensor with the system requirements.