New York Low Pressure Boiler Certificate Of Fitness (COF) Practice Test

A photoelectric cell is primarily used for flame detection. This device operates by sensing the presence of light, specifically the infrared or ultraviolet light emitted from a flame. When a flame is present, the photoelectric cell detects the light and signals that the combustion process is occurring properly. This function is crucial for ensuring safety in a boiler system, as it helps prevent hazardous situations such as fuel buildup or incomplete combustion. In the context of boiler operation, flame detection is critical for maintaining safe and efficient functioning, as it ensures that the burner is ignited and that the flame remains stable. If the flame goes out or is not detected, the safety system can shut down the fuel supply to prevent accidents. Thus, the primary role of a photoelectric cell in this context is to provide reliable flame detection, making the correct answer C.