Arizona Plumbing Practice Exam

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A cadmium cell in an oil burner control system is used to achieve what function?

  1. Control temperature

  2. Detect pressure

  3. Detect flame

  4. Regulate flow

The correct answer is: Detect flame

A cadmium cell in an oil burner control system functions to detect flame. This type of sensor is sensitive to the light produced by a flame, allowing it to determine whether the burning process is occurring as intended. If the flame goes out or is not present, the cadmium cell will detect this lack of light and send a signal to the control system, prompting it to take appropriate action, such as shutting off the fuel supply to prevent hazardous conditions. This detection mechanism is critical in maintaining safety in oil burner operations. The proper functioning of the cadmium cell ensures that the burner only operates when a flame is present, which helps in preventing fuel from accumulating unburned and reducing the risk of explosions or fires.

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