Do you know what a thermocouple does? It is a sensor of temperature that produces a voltage based on temperature differences between metals and alloys. The thermocouple is made up of two metal wires that are dissimilar and joined at the end to form a junction. This junction produces a small amount of voltage when exposed to temperature gradients. It is called the measuring junction. Learn more about these sensors by reading our Thermocouples guide.
The Seebeck effect is the name of this phenomenon. This occurs because metals with different electron configurations will have varying thermal conductivity and electron density. When the junction is exposed a temperature differential, the flow of electrons between the hotter and colder metal causes an electric current.
A voltmeter, or other temperature measuring device can read and measure the voltage produced by thermocouples. The temperature can be determined by knowing the relationship between temperature and voltage output. This is usually described in a table or equation that is specific to the type thermocouple used.
Types and uses of thermocouples
There are many different types of thermocouples, each with their own characteristics. For example, the temperature range or robustness. Each thermocouple has a specific letter, such as Type K. Other common thermocouple types include Type J, Type T, Type L, and Type K
The letters indicate the temperature at which they can be used. J-Type, for example, is made of iron and copper-nickel, and can be used from 0degC up to 816degC depending on the other characteristics. Some thermocouples have an extra sheath to insulate their wires and prolong their lifespan.
Thermocouples have been widely used for many years in various industries to monitor and control temperature. These thermocouples are popular for measuring high temperatures. They are robust, reliable, and affordable.
A thermocouple measures temperature. The thermocouple is made up of two metallic wires that are dissimilar and joined to form a joint. The thermocouple can measure the temperature by measuring the voltage generated when the junction is heated.
Theoretically, any two metals could be used to create a thermocouple, but in reality, there is a limited number of common types. These thermocouples have been designed to provide improved accuracy and linearity. They are made of specially developed alloys.
Thermocouples are available in a variety of sizes and shapes to meet almost any need. They can be designed to be robust and fast-responding, as well as to measure a wide range of temperatures.