How does a thermocouple thermometer work?
About Thermocouples A thermocouple is a type of metal thermometer that can measure a tremendously wide range of different temperatures. While thermocouples are often not extremely precise, they can work in environments other thermometers can’t. There are specially designed thermocouples that can measure temperatures to nearly absolute zero and others that can work in the hottest ovens. How They Work A thermocouple does not measure absolute temperature, but rather the difference in temperature between two points. When one end of a conductor, such as a metal strip, is hotter than the other, it creates a voltage between the two ends. The greater the temperature difference, the greater the current. Different metals react at different rates, and a thermocouple actually makes use of two metals, joined at the sensor end. At the circuitry end, they are attached to a meter that uses the difference in voltages between the metals to calculate the temperature differential. Reference Temperature Si
