For more information about how a thermocouple works, watch this short video or contact our temperature measurement experts. Great post! I specifically like how you clearly explained Base metal thermocouples — not a lot of people have a full understanding of what these are, nor their classifications.
Our website uses cookies. By continuing to use it, you agree to their use. Further information Agree. Thermocouple Working Principle The working principle of a thermocouple follows the Seebeck effect, or thermoelectric effect, which refers to the process in which thermal energy is converted into electrical energy.
Metal Pairings in Thermocouples For a thermocouple to work well, its two wires should offer as much contrast as possible in individual electronegativities. Contact Us. One Response to. A thermocouple is a simple, robust and cost-effective temperature sensor used in a wide range of temperature measurement processes.
Thermocouples are manufactured in a variety of styles, such as thermocouple probes, thermocouple probes with connectors, transition joint thermocouple probes, infrared thermocouples, bare wire thermocouple or even just thermocouple wire. Thermocouples are commonly used in a wide range of applications. Due to their wide range of models and technical specifications, but it is extremely important to understand its basic structure, functionality, ranges as to better determine the right thermocouple type and material of thermocouple for an application.
When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in the thermoelectric circuit. If this circuit is broken at the center, the net open circuit voltage the Seebeck voltage is a function of the junction temperature and the composition of the two metals.
Which means that when the junction of the two metals is heated or cooled a voltage is produced that can be correlated back to the temperature. Learn More.
Thermocouples are available in different combinations of metals or calibrations. Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple.
Although thermocouple calibration dictates the temperature range, the maximum range is also limited by the the diameter of the thermocouple wire. That is, a very thin thermocouple may not reach the full temperature range. K Type Thermocouples are known as general purpose thermocouple due to its low cost and temperature range. How do I choose a thermocouple?
Because a thermocouple can take many shapes and forms, it is important to understand how to correctly select the right sensor. The most commonly criteria used to make that choice are the temperature range, the chemical resistance, the abrasion and vibration resistance and the installation requirements.
Since then the technology has developed and advanced to what it is today. They are now used in many different appliances from food preparation to pharmaceutical manufacturing. Manufacturing of a thermocouple. Since the discovery of temperature measurement, the manufacturing of the device has continued to be simple but effective. The two metal alloys come together to form a junction. One part of the junction is placed on the source where the temperature needs to be measured.
The second point of the junction is maintained at the constant temperature source. The temperature range is dependent on the type of metal used in the manufacturing of the thermocouple. Nickel and nickel have a temperature range of to 1,, while rhenium and rhenium measures from 0 to 2, degrees. The construction of a thermocouple is simple, and manufacturers assemble the temperature gauges from the pair of wires. A protective layer of insulated tubing usually covers these wires.
Manufacturers of thermocouples decide the combination of metals and calibration used to assemble. The use of the thermocouple is dependant on the environment. The different diameters and materials are all factors considered when manufacturing the specific type of thermocouple.
In other cases, the installation of a thermocouple to a pre-existing system can alter how the manufacturer designs the device.
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