On a commercial intrusion detection system, beam detectors can be effectively used for which application?

Beam detectors are particularly well-suited for perimeter security applications, such as around the perimeter of a fence where expensive equipment is stored outside. These detectors work by emitting an invisible beam of light (often infrared) between a transmitting and a receiving unit. When an intruder crosses the beam, it triggers an alarm, thereby alerting security personnel to an unauthorized entry.

In environments where sensitive or high-value assets are present, having a reliable and early warning system is critical for preventing theft or damage. Beam detectors can cover a wide area and create an invisible security barrier, making them ideal for outdoor scenarios, especially where a clear line of sight can be maintained.

Other applications, such as occupancy detection in restrooms or access control in elevators, typically require different types of sensors that are better optimized for those specific environments. For example, motion sensors or pressure mats may be more effective for occupancy detection, while card readers or biometric scanners are often utilized for access control in controlled environments like elevators. Therefore, option A stands out as the most appropriate application for beam detectors in a commercial intrusion detection system.