What type of thermocouple is commonly used in gas heating applications?

In gas heating applications, millivolt thermocouples are commonly utilized due to their ability to generate a small voltage in response to temperature changes, which is particularly effective for measuring temperatures in combustion systems. They are designed to operate at lower temperatures and can function with minimal power requirements, making them suitable for monitoring pilot lights and ensuring safe operation of gas appliances.

Their construction typically involves materials such as nickel or chromel, and they can operate effectively in harsh environments typically found in heating applications. By providing reliable temperature readings, millivolt thermocouples help in maintaining proper combustion conditions and ensuring safety measures are adhered to in gas heating systems. This reliability and efficiency in operation make them the preferred choice in these settings.