G2 Gas Fitter Practice Exam

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How does a resistance temperature detector sense changes in temperature?

  1. By measuring the voltage drop

  2. By the increase in resistance of a wire as temperatures increase

  3. By a curl effect in the wire structure

  4. By direct contact with water

The correct answer is: By the increase in resistance of a wire as temperatures increase

A resistance temperature detector (RTD) operates on the principle that the resistance of certain metals changes predictably with temperature. As the temperature increases, the atoms in the metal vibrate more vigorously, which impedes the flow of electrons, resulting in an increase in electrical resistance. This relationship is linear within a specific temperature range for most metals, making RTDs accurate and reliable for temperature measurements. By utilizing the increase in resistance as the temperature rises, the RTD can provide precise readings. The changes in resistance are measured through electrical circuits and can be converted into temperature readings using calibration data. This fundamental mechanism of sensing temperature through resistance changes is what makes RTDs a standard choice for many industrial and scientific applications.

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