A thermocouple is an electrical device used most commonly to gauge a wide range of temperature changes also known as a temperature sensor. The way it works is that two different electrical conductors are used to form electrical junctions. A voltage is produced at a single junction of two different conductors as a result of thermoelectric effect. This voltage can be used to interpret varying measurements of temperatures. There are different types of thermocouples that are used for different applications. Sentro Tech offers four of these different types of thermocouples for your commercial and industrial needs: K-Type Thermocouple, S-Type Thermocouple, R-Type Thermocouple, and B-Type Thermocouple.
The k-type thermocouple is the most commonly used, inexpensive electrical device that can measure temperatures from -300°F to +2460°F. This type of thermocouple is magnetic, typically made of nickel, with a property to change its output when the material reaches its Curie point at around 365°F. The k-type thermocouple functions very well in oxidizing atmospheres except when coming into contact with hydrogen, which can cause green rot.
The s-type thermocouple is used for high temperature applications that can reach up to around 2900°F. S-type thermocouples can also be used in lower temperature processes because of its accuracy and stability. However, the s-type thermocouple is most frequently used in high temperature procedures and most commonly found in the biotech or pharmaceutical industries. As with all platinum-type thermocouples, the s-type thermocouple needs to be protected in a ceramic tube.
The r-type thermocouple is very similar to the s-type thermocouple. It is also used in high temperature applications that can reach up to 2900°F. The r-type thermocouple should never be used in reducing atmospheres, and as with all platinum-type thermocouples should always be protected in a ceramic tube.
The b-type thermocouple can be used in temperature applications of up to around 3200°F. This platinum-type of thermocouple can be used in oxidizing or inert atmospheres with applications in the range of 1000°F to 3100°F. B-type thermocouples should also never be used in reducing atmospheres. This type of thermocouple should also always be protected within a ceramic tube.