What type of system is a contact sensor?

A contact sensor is specifically designed to detect the opening and closing of doors or windows. It works using a pair of magnets, with one part attached to the movable surface (like a door or window) and the other part fixed to the frame. When the door or window is closed, the two magnets are aligned, and the circuit remains closed. If the door or window opens, the magnets separate, breaking the circuit and sending a signal to the alarm system, indicating that entry has occurred.

This functionality is crucial in security systems, as it provides information on potential intrusions and helps in monitoring the premises. While other devices in security systems may monitor various environmental changes or conduct surveillance, contact sensors have a distinct purpose focused specifically on the status of entry points in a building, making them vital for comprehensive security solutions.