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What device is used to measure flue gas temperature?

  1. Thermocouple

  2. Pyrometer

  3. Thermometer

  4. Barometer

The correct answer is: Pyrometer

A thermocouple is a device that measures temperature by utilizing the difference in voltage produced by two different metals. While a thermocouple can measure high temperatures, it is not specifically designed for flue gas temperature measurement. A thermometer is a general purpose device that measures temperature by using either a liquid filled bulb or a metal probe. While it can measure temperature accurately, it may not be suitable for measuring the high temperatures found in flue gases. A barometer is a device used for measuring atmospheric pressure, not temperature. It is not suitable for measuring flue gas temperature. The correct answer is a pyrometer, which is specifically designed to measure high temperatures, making it the most suitable device for measuring flue gas temperature accurately.