What is the function of a photoelectric cell in an oil burner system?

The function of a photoelectric cell in an oil burner system is primarily for flame detection. This device is designed to sense the presence of a flame by responding to the light generated during combustion. When the burner operates, the photoelectric cell monitors the intensity of the light emitted by the flame to ensure that it is burning correctly. If the cell does not detect the flame, it can trigger a safety response, such as shutting off the fuel supply to prevent the release of unburned fuel, which could lead to hazardous conditions.

The other options do not accurately represent the function of the photoelectric cell. Fuel adjustment is typically managed by mechanical controls or electronic systems that regulate the flow of oil to the burner. Temperature regulation relies on thermostats and control systems to maintain the desired heat output, while pressure monitoring involves different sensors that measure and control the pressure of the fuel oil being supplied to the burner. These functions are essential for the overall operation of the oil burner system but are distinct from the specific role of the photoelectric cell.