Which principle does the low water fuel cut-off operate on?

The low water fuel cut-off operates on the principle of buoyancy. This device is crucial for the safe operation of boilers, ensuring that the water level remains above a minimum threshold.

When water levels drop, the buoyancy of the mechanism indicates that there is insufficient water to safely operate the boiler. As the water level decreases, objects designed to float, such as a float switch, will also lower, triggering the cut-off. This prevents fuel from entering the burner, thus avoiding potential damage or hazards, such as overheating or a complete burnout of the boiler.

Understanding buoyancy's role is essential because it directly relates to how the low water cut-off identifies changes in water levels through the floating mechanism, acting to ensure the safe operation of the boiler system.