When one of the smoke detector's sensitivity level is out of its listed range because it is too dirty to be adjusted any longer, what indication will the control panel display?

When one of the smoke detector's sensitivity level is out of its listed range because it is too dirty to be adjusted any longer, what indication will the control panel display?

• A. Alarm
• B. Trouble
• C. Normal
• D. Supervisory

Answer: (B)

When a smoke detector can no longer be adjusted because it’s too dirty, it isn’t functioning within its required range. That situation is treated as a sensor fault in the fire alarm system. The control panel signals this as a trouble condition to alert maintenance that the detector needs cleaning or replacement. This is different from an alarm (smoke detected and system sounding), a supervisory condition (issues requiring attention to a protected device but not a fault in the sensor itself), or normal (no problems). So the panel displays trouble to indicate a fault in the detector that requires service.

When a smoke detector can no longer be adjusted because it’s too dirty, it isn’t functioning within its required range. That situation is treated as a sensor fault in the fire alarm system. The control panel signals this as a trouble condition to alert maintenance that the detector needs cleaning or replacement. This is different from an alarm (smoke detected and system sounding), a supervisory condition (issues requiring attention to a protected device but not a fault in the sensor itself), or normal (no problems). So the panel displays trouble to indicate a fault in the detector that requires service.