Getting To Learn About The Various Thermocouple Types As Well As Their Application
Wednesday January 16, 2013 1:50am

A thermocouple is equipment used in the measurement of temperature under different conditions. It is used in industries as well by some scientist in their studies. There are various thermocouple types that are commonly recognized and used.

The advantage with thermocouples is that, unlike other temperature measurement equipments used, thermocouples generate their own power and do not need any external form of excitation for them to function. They are employed in wide ranges of temperatures. These devices are also applied in the conversion of temperature gradients to generate electricity. Thermocouples are therefore very useful in different areas where the measurement and control of temperatures are needed.

The most common types are J, K, T, B, S, R and E. Each thermocouple is made up of two conductors of different materials generally metal alloys. The metal alloys produce electrical energy in the area where the two conductors are in contact. This point of contact is where one gets to measure the temperature and also the voltage released due to contact of the two conductors. Thermocouples are used as temperature sensors which help in temperature control and measurement.

Type S, R and B are considered as the most stable devices among the rest. They have a lower degree of sensitivity in comparison with the other types. These three consists of platinum rhodium alloys in each conductor. The cost of these three devices is a bit higher and is only applied in cases of very high temperatures. Type B can only be applied in temperatures not more than 1800 degrees while type R and S cannot be used in conditions exceeding 1600 degrees.

Another device is type K which is mostly used since it is relatively cheaper compared to the other devices. It is made of alumel and chrome alloys. Type J share magnetic properties with device K. However, the two differ in that J has a higher degree of sensitivity than K. The only bad side with type J is that it cannot be used in big range of temperatures. Another type similar to K is type N. This device has a higher sensitivity and it is applied in measurement and control of temperature under high conditions.

The other set of type T and E differ from J and K in that they lack magnetic properties. This is because they are made up of alloys that are not magnetic in each conductor. For Instance, type T is made of constantan and copper as the conductors. The two conductors do not have magnetic aspects.

There are also types C and M. These two are applied in high temperature conditions. The two are applied in making vacuum heaters since of this property. However, type C and M are not mostly used in comparison with the other devices.

There are some factors to consider before using any of the thermocouple types is the cost and the condition of the atmosphere, that is, the temperature levels. Deciding on the most appropriate device to use greatly depends on the consistency and sensitivity of the device.

The most common types are J, K, T, B, S, R and E. Each thermocouple is made up of two conductors of different materials generally metal alloys. The metal alloys produce electrical energy in the area where the two conductors are in contact. This point of contact is where one gets to measure the temperature and also the voltage released due to contact of the two conductors. Thermocouples are used as temperature sensors which help in temperature control and measurement.

Type S, R and B are considered as the most stable devices among the rest. They have a lower degree of sensitivity in comparison with the other types. These three consists of platinum rhodium alloys in each conductor. The cost of these three devices is a bit higher and is only applied in cases of very high temperatures. Type B can only be applied in temperatures not more than 1800 degrees while type R and S cannot be used in conditions exceeding 1600 degrees.

Another device is type K which is mostly used since it is relatively cheaper compared to the other devices. It is made of alumel and chrome alloys. Type J share magnetic properties with device K. However, the two differ in that J has a higher degree of sensitivity than K. The only bad side with type J is that it cannot be used in big range of temperatures. Another type similar to K is type N. This device has a higher sensitivity and it is applied in measurement and control of temperature under high conditions.

The other set of type T and E differ from J and K in that they lack magnetic properties. This is because they are made up of alloys that are not magnetic in each conductor. For Instance, type T is made of constantan and copper as the conductors. The two conductors do not have magnetic aspects.

There are also types C and M. These two are applied in high temperature conditions. The two are applied in making vacuum heaters since of this property. However, type C and M are not mostly used in comparison with the other devices.

There are some factors to consider before using any of the thermocouple types is the cost and the condition of the atmosphere, that is, the temperature levels. Deciding on the most appropriate device to use greatly depends on the consistency and sensitivity of the device.

If you are in the market for type j thermocouple parts consider STI Manufacturing. We also provide custom Thermowell and RTD styles for your applications, at http://www.stimfg.com.