Which safety device is not required on an electrode boiler with submerged electrodes?

An electrode boiler operates differently compared to traditional boilers, particularly due to the way it heats water. In an electrode boiler, the heating elements are submerged in water and rely on direct electrical current for operation. The safety devices required for such systems focus primarily on preventing overheating and managing pressure and water levels.

In the case of the low water cut-off device, its primary function is to prevent the boiler from running dry, which could lead to damage and safety hazards in a conventional boiler. However, electrode boilers are designed in such a way that they will not operate unless there is an adequate water level. The submerged electrodes will not contact the water if it falls below the necessary level to complete the electrical circuit, effectively rendering a low water cut-off unnecessary.

On the other hand, safety valves, gauge glasses, and blow-off valves serve critical functions in maintaining operational safety and ensuring that any potentially hazardous conditions, such as water pressure or temperature abnormalities, are managed appropriately. Therefore, the low water cut-off is the safety device that is not required in the operation of an electrode boiler with submerged electrodes, as its design inherently mitigates the risk of low water conditions.