Home Technology Common Questions People Ask About Thermocouple sensor

Common Questions People Ask About Thermocouple sensor


The thermocouple Sensor serves an essential purpose by precisely measuring sensitive temperatures with great accuracy to have the best results. Its low price point paired with its design and durability makes it an important asset, especially for the furnace or oven industry. 

Common Thermocouple FAQ

Temperature range of a thermocouple

There are several types of thermocouples, and each has their own temperature range. For precedent, a Type T thermocouple with its Copper leg has a max temperature of 370C or 700F. Type K thermocouple, on the other hand, can be used for 1260C or 2300F. 

Most importantly, an extensive temperature range is the thermocouple thermometer’s greatest asset, and they typically have a degree from zero to 1800˚C.

Type B is used in notably high-temperature applications. It has the most highest temperature limit of all of the thermocouple types. It maintains a high level of precision and durability at very high temperatures.

How long can a thermocouple wire be?

For a precise instrument, check its specifications to see any ends to the input impedance. However, according to the thumb rule, limit the resistance to 100 Ohms resistance maximum, which depends on the gage of the wire; the more significant the diameter, the less resistance, the higher the run can be. However, suppose the environment is electrically noisy. In that case, a transmitter may be required, which transmits a 4-20 mA signal that can be run more prolonged distances and is more resistant to noise.

Do thermocouples tell you the temperature?

Yes, but thermocouples do but in a separate way than other types of thermometers. When one end is heated, it generates a voltage, commonly known as a difference in potential—the voltage generated with respect to the temperature difference between the measurement and source junction. By using established tables, we can interpret the voltage examination into a temperature reading.

Can thermocouples only measure hot temperatures?

No, thermocouples can measure cold and hot temperatures. All sorts of temperatures, which ranges from -200°C to +2300°C, can be measured by a thermocouple. Two different metals make up a thermocouple. These metals can be pure or mixtures of elements, i.e. alloys that have different properties. The combination of specific metals makes for thermocouples that perform well in certain temperature ranges; some are suitable for measuring really hot temperatures, and some are really cold. Certainly, knowing the temperature range that will measure is an important aspect considered when choosing a thermocouple for an application.


Process of temperature sensing that occurs in all sorts of activities going on around us. I believe you have discovered a little bit more about the role of thermocouples, how they work, and why we are using them. 

A thermocouple sensor does not directly measure temperature as you would expect from mercury-based thermometers. Alternatively, you need to establish the mathematical relationship between the voltage produced from the output and the temperature changes remarked from the input end.