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The sensor can either be an RTD, resistive thermal device or a thermocouple.
In the case of RTD, the resistance of the device changes with the temperature.
This resistive value is sent to a calibrated meter or gauge. A RTD device is far more accurate than a thermocouple. Plus or minus .1 of 1%.
In the case of a thermocouple a small voltage is created by the device which varies with the temperature. This is sent to the reading device or gauge. Plus or minus 2 0r 3 degrees.
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