Introduction to S-type thermocouple
S type thermocouple is also called single platinum rhodium thermocouple. Its index number is S index number. It mainly measures the temperature of the medium from 0 to 1600°C. It is a category of precious metal thermocouples. Normally used in high temperature applications such as coking plants and steel plants.
Advantages and disadvantages of S-type thermocouple
The S-type thermocouple has the highest accuracy, the best stability, wide temperature measurement zone, and long service life among the thermocouple series. It has good physical and chemical properties, thermoelectric potential stability and good oxidation resistance at high temperatures, and is suitable for oxidizing and inert atmospheres.
The disadvantage of the s-type thermocouple is the thermoelectric potential. The thermoelectric potential rate is small, the sensitivity is low, the mechanical strength is reduced at high temperature, and it is very sensitive to pollution. The precious metal materials are expensive, so the one-time investment is relatively large.
S-type thermocouple temperature measurement range
S-type thermocouple has the highest measurement accuracy when the normal long-term use temperature is about 800~1300℃, while the temperature measurement accuracy within 800℃ is not high, and the long-term use temperature above 1300℃ will easily damage the thermocouple, so Choosing the thermocouple with the correct graduation number is an important factor to ensure the accuracy of temperature measurement.
Introduction to T-type thermocouple
T-type thermocouple is also called copper-constantan thermocouple (copper/nickel-copper thermocouple, graduation number T, measuring range -200~+350℃), and it is also a kind of best thermocouple for measuring low temperature and cheap metal. Its positive electrode (TP) is pure copper, and the negative electrode (TN) is a copper-nickel alloy called constantan. It is common with Ni-Cr-Constantan constantan EN, but not with iron-Constantan constantan JN. Although they are called constantan, the measuring temperature range of copper-copper-nickel thermocouples is -200~350℃.