What is a monitoring device in a fire alarm system, and what is a typical example?

• A. It monitors the status of a protected component and sends a supervisory signal
• B. It is a manual alarm initiating device
• C. It logs data only and does not signal
• D. It extinguishes fires automatically

Answer: (A)

A monitoring device in a fire alarm system watches the status of a protected component and reports a supervisory signal to the control panel when that status changes or a fault is detected. This keeps the system informed about whether critical equipment is in the correct position and ready, rather than sounding an alarm by itself.

A typical example is a valve supervisory switch on a sprinkler system’s main control valve. It tells the fire alarm control panel whether the valve is in the required open or closed position. If the valve isn’t in the expected state, a supervisory signal is sent so maintenance can check it. This differs from manual alarm devices (which need a person to trigger an alarm), from data-logging devices (which may record info without signaling), or from devices that physically extinguish fires automatically.