What is the primary function of a flame rod in a gas pilot system?

The primary function of a flame rod in a gas pilot system is to ensure that the gas pilot is lit. A flame rod, which is also known as a flame sensor, works by detecting the presence of a flame. When the pilot light is lit, the flame rod generates a small electrical signal due to the ionization of the gas in the flame. This signal is used to confirm that the pilot is operating correctly. If the flame goes out, the signal ceases, and safety mechanisms can activate to shut off the gas supply, preventing the risk of unburned gas accumulating, which could lead to dangerous situations.

The role of the flame rod is crucial in maintaining safe operating conditions and ensuring system reliability, as it provides real-time feedback on the status of the pilot flame. In contrast, other options focus on different functions not related to the flame rod, such as measuring temperature, regulating gas flow, or detecting water levels in a boiler. Each of these functions is important for the overall operation of the system but does not pertain to the specific function of the flame rod.