If a door sensor is removed for cleaning, what should the alarm system do?

• A. A general alarm
• B. A component-specific supervisory signal
• C. Notify occupant by voice
• D. Trigger an audible alarm

Answer: (B)

When a monitored door sensor is removed for cleaning, the system should signal a supervisory condition for that specific device. This type of signal shows a fault or maintenance state without triggering a full burglar alarm or audible alert. Door sensors are designed to be supervised so the control panel (and often the monitoring station) knows exactly which device is temporarily out of service and needs reinstallation. It keeps the system from misinterpreting the absence as a real entry attempt, while still alerting you that attention is needed.

In practice, you’d typically see a trouble or supervisory indication at the panel and possibly a silent notification to the monitoring service, rather than a general alarm or an occupant voice alert. Once the sensor is reinstalled and tested, the supervisory condition is cleared and the system returns to normal.