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A supervisory signal to the fire alarm control panel concerning gravity tanks is triggered by high or low water levels. This condition is vital for maintaining the functionality of the fire suppression system. Gravity tanks are designed to supply water for firefighting purposes, and monitoring their water levels ensures that an adequate supply is always available in emergencies.
When the water level reaches a predetermined threshold, either too high or too low, the supervisory signal alerts the fire alarm system. A low water level might indicate a problem such as a leak or insufficient replenishment of the water supply, while a high water level could suggest overflows or issues with the tank's input mechanisms. This active monitoring is crucial because it assists in the prevention of potential fire safety hazards by ensuring that the water supply is both reliable and sufficient at all times.
Other options, while they relate to general conditions that can affect system performance and safety, do not directly trigger this specific supervisory signal in the context of gravity tanks.