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Basics About A Type J Thermocouple

By Cathy Mercer

Type J thermocouple like any other thermocouple comprises of two conductors of different materials. The dissimilar conductors remain in contact and produce a voltage when they are heated. The scale of the voltage produced is dependent on temperature difference between other circuit parts and the junction. Besides being used to turn a gradient in temperature into electricity, they are also used to measure and control temperature.

The working of thermocouples was originally discovered by a German scientist in 1821. It was realized that any junction of metals of unlike kind will produce a voltage potential when exposed under a temperature difference. This effect is referred to as thermoelectric or Seebeck. Thermocouples that are intended for practical application are produced from standard metal alloys, which have a predictable and repeatable relationship between the temperature and voltage.

Different temperature ranges might be gauged using different alloys. When buying a thermocouple, there exists some factors to think of. One of them is capability to resist corrosion. In situations where the measurement point is a far away from the measuring gadget, the space between could be covered by extension cables. The cables must be of materials that are cheaper than the sensor materials.

Type J thermocouples are standardized against reference values of 0 degrees Celsius. They compose of copper-nickel alloy and an iron metals. The iron functions as the positive end and is usually white colored. The copper-nickel alloy functions as the negative end and is usually red colored in may situations. J is the second most utilized and most widespread thermocouple after type K.

This sensor has a sensitivity of over 50 microvolts for every degree centigrade of temperature. That sensitivity works at a temperature range of between -210 to 1200 degrees Celsius. The Curie point of iron in the positive lead which is placed at 770 degrees Celsius limits the range of the device between -40 to 750 degrees Celsius. At the Curie point, iron goes through a molecular change from which it cannot recover.

Type J thermocouples fall among the most inexpensive sensors and work best in certain settings. For instance, the devices are not to be exposed to extremely high temperatures in oxidizing environments. High temperatures should work with a reduction environment. It is a good gadget for using on general purpose applications, which do not involve moisture or water conditions. Heavier gage size gadgets should be utilized for applications that entail temperatures that reach the upper limits of the equipment.

The service life of the product depends on the size of the wires. The rate of oxidation in devices with heavier wires is slow hence they last longer than those with fine wires. Oxidation also occurs at a higher rate at temperatures beyond 540 degrees Celsius. If the precautions are followed well, it can be used for measuring temperature in diesel engines, gas turbine exhausts, and kilns.

Type J thermocouple could be purchased from virtually any kind of shop that stocks electrical devices anywhere internationally. They are replaceable and inexpensive. This has the meaning that those, which become faulty, can be substituted with fresh ones. This makes sure that operations are never interrupted.

If you are looking for the best selection of type K or type J thermocouple parts, click You will find many selections at low prices, when you visit the STI Manufacturing site today at

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Article Citation
MLA Style Citation:
Mercer, Cathy "Basics About A Type J Thermocouple." Basics About A Type J Thermocouple. 16 Apr. 2014. 21 Nov 2014 <>.

APA Style Citation:
Mercer, C (2014, April 16). Basics About A Type J Thermocouple. Retrieved November 21, 2014, from

Chicago Style Citation:
Mercer, Cathy "Basics About A Type J Thermocouple"

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