A magnetic contact that indicates an abnormal condition for a door or barrier is typically known as what?

A magnetic contact that indicates an abnormal condition for a door or barrier is typically known as what?

• A. Door position switch
• B. Reed switch
• C. Magnetic sensor
• D. Proximity sensor

Answer: (A)

Monitoring door status with a magnetic contact is about detecting whether a door or barrier is in the required position. The device designed to indicate an abnormal condition, such as a door left open, is the door position switch. It is the component that reports the door’s open or closed state to the building automation or security system, so the controller can flag an abnormal condition and respond accordingly. The magnetic contact is typically built from a sensing element like a reed switch, which reacts to the presence of a magnet, but the overall function—reporting door position to the system—is that of a door position switch. A magnetic sensor is too broad a term for this specific door-status role, and a proximity sensor isn’t the standard tool used for door status in most access-control or BAS setups.

Monitoring door status with a magnetic contact is about detecting whether a door or barrier is in the required position. The device designed to indicate an abnormal condition, such as a door left open, is the door position switch. It is the component that reports the door’s open or closed state to the building automation or security system, so the controller can flag an abnormal condition and respond accordingly. The magnetic contact is typically built from a sensing element like a reed switch, which reacts to the presence of a magnet, but the overall function—reporting door position to the system—is that of a door position switch. A magnetic sensor is too broad a term for this specific door-status role, and a proximity sensor isn’t the standard tool used for door status in most access-control or BAS setups.