What allows a fire eye or flame scanner to keep the burner circuit energized?

A photoelectric transducer is crucial for a fire eye or flame scanner in maintaining the burner circuit's energization. This device operates by detecting the presence of a flame through the measurement of light emitted by the burning fuel. When the flame is present, the photoelectric transducer generates an electrical signal that indicates to the control system that the burner is operating safely and effectively. This signal allows the burner circuit to remain energized, which is vital for continuous operation and safety of the burner system.

In the context of combustion systems, having a reliable flame detection method is essential, as it prevents dangerous situations such as a flame failure or blowback. The photoelectric transducer’s sensitivity to light allows it to respond quickly to changes in flame conditions, ensuring that the burner is shut off in the event of flame failure, thereby enhancing safety.

Other options, while relevant in different contexts, do not serve the specific role of sustaining the burner circuit's energization in the same way that a photoelectric transducer does. For instance, photovoltaic cells convert light into electrical energy and can be used in various applications, but they are not specific to flame detection in burner operations. Infrared detectors can sense temperature variations and are used in some fire detection systems, but they do not