In physical security, what is the primary role of sensors in an intrusion detection system?

The primary role of sensors in an intrusion detection system is to detect unauthorized access or disturbances within a secured area. When a door is opened, sensors, such as door contacts or motion detectors, can trigger an alert, indicating that a potential intrusion is occurring. This immediate response is crucial for the security of the premises, as it initiates further actions, like notifying security personnel or sounding alarms.

While monitoring environmental conditions is important for systems that ensure safety (like temperature or humidity sensors), that function is secondary for an intrusion detection system. The ability of sensors to receive and process data relates to their operational capability, but their fundamental purpose is to detect breaches. Generating reports may be a feature of the overall system, related to system efficiency and management, but it does not capture the primary function of sensors in detecting intrusions. The essence of their role lies in immediate alerts concerning unauthorized access.