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A critical component of a boiler's flame sensing system is the use of flame rods or UV sensors that detect flame presence. These devices play an essential role in ensuring the safe operation of the boiler by confirming that a flame is indeed present when fuel is being supplied. If there is no flame detected, the system can trigger alarms or shut down the fuel supply to prevent dangerous situations, such as an explosion or the release of unburned fuel into the boiler.

Flame sensing devices, such as flame rods, typically use electrical resistance to detect the presence of a flame, while UV sensors utilize ultraviolet light to confirm that combustion is occurring. These mechanisms are integral to maintaining safe operating conditions and are a fundamental aspect of boiler safety systems.

While pressure gauges, temperature sensors, and water level indicators are crucial for monitoring and maintaining the overall performance and safety of a boiler, they do not specifically function to confirm the presence of flame for combustion purposes. Therefore, the detection of flame presence is uniquely addressed by the flame sensing components, highlighting their critical role in the boiler's operation.