What type of thermocouples are typically used to measure turbine engine exhaust gas temperatures?

Chromel/Alumel thermocouples are the standard choice for measuring turbine engine exhaust gas temperatures due to their excellent temperature range capabilities and durability under extreme conditions. They are capable of withstanding high temperatures, making them ideal for the harsh environment of a turbine engine where temperatures can soar to several hundred degrees Celsius.

The Chromel (nickel-chromium alloy) leg of the thermocouple provides good resistance to oxidation, while the Alumel (nickel-aluminum alloy) leg complements it by offering stable properties and a reliable voltage output across a wide temperature range. This combination makes Chromel/Alumel thermocouples particularly effective for providing accurate temperature readings, which are crucial for the performance and safety of turbine engines.

Their ability to maintain accuracy and reliability at elevated temperatures is key in aviation applications, where precise data is necessary for engine monitoring and control. This is why Chromel/Alumel thermocouples are widely used in aerospace applications, specifically for measuring turbine engine exhaust temperatures.