What is the primary function of a thermopile?

The primary function of a thermopile is to convert temperature differences into electrical voltage. This device is made up of multiple thermocouples connected in series or parallel, allowing it to generate a larger voltage output when there is a temperature gradient across its junctions. The voltage produced is directly related to the temperature differential, making thermopiles particularly useful in applications that require the measurement of temperature changes or the generation of electrical signals from thermal energy.

In practical applications, thermopiles are commonly used in gas appliances, where they can serve as safety devices. For instance, in a pilot light assembly, a thermopile generates voltage to keep the gas valve open as long as the pilot is lit, thereby preventing gas leakage. This highlights its critical role in both safety and functionality in gas systems.

Understanding the operation of a thermopile underscores its importance in converting thermal energy to electrical energy, which can then be used to power devices or control systems.