What is the function of a thermocouple in an oil burner?

The correct answer identifies the primary role of a thermocouple in an oil burner system, which is to sense the presence of a flame and communicate that information to safety controls. When the burner is operating, the thermocouple generates a small voltage in response to the heat of the flame. This voltage is utilized by the safety controls to ensure that the burner remains lit. If the flame goes out, the thermocouple will detect the absence of heat, causing the safety controls to shut off the fuel supply, thereby preventing potentially hazardous conditions such as an oil leak or fire.

Understanding the function of the thermocouple is crucial for maintaining safe and efficient operation in oil burners. It directly contributes to the overall safety mechanisms in place that protect both the equipment and the surrounding environment from the dangers associated with malfunctioning burners.