What is the function of a proximity sensor in access control?

A proximity sensor's primary function in access control systems is to detect the presence of a credential holder nearby. This is typically achieved through various technologies, such as RFID or infrared, enabling the system to recognize when an authorized individual approaches a door or entry point. When a credential, like a card or fob, is within a certain range of the sensor, it triggers the access control mechanism to grant entry.

This functionality enhances security by allowing seamless and contactless access for authorized personnel while preventing unauthorized access by those without proper credentials. Such sensors are integral in modern access control systems, improving convenience and efficiency in securing facilities.