What is the process of flame rectification primarily used for?

Flame rectification is a critical safety feature commonly used in gas appliances to verify that a pilot flame or main burner flame is present. This process relies on the principle that a flame can conduct electricity, allowing a sensor to detect the current that flows through the flame. When the sensor confirms the presence of a flame, it provides a signal to the control system to allow fuel to flow to the burner, thus ensuring that the appliance operates safely.

If the flame were to go out, the absence of electrical current would signal the control system to shut off the gas supply, preventing dangerous accumulations of unburned gas. This mechanism is essential in maintaining safe operation in heating systems and appliances that rely on flame use, contributing to overall system reliability and safety.

Other choices such as generating electricity, controlling gas flow, and igniting burners focus on functions that are not the primary role of flame rectification. Instead, flame rectification specifically targets the confirmation of flame presence as a safety measure.