There are many kinds of thermocouple indexing number, here Beijing Haohai Yantian summarized several thermocouple commonly used indexing number corresponding characteristics and measurement temperature scale!
One, S type thermocouple:
Platinum rhodium 10-Platinum thermocouple, temperature scale 0 ~ 1300℃;
Advantages of TYPE S thermocouple:
1. Excellent heat resistance, stability, reproducibility and superior accuracy;
2. Excellent oxidation resistance and corrosion resistance;
3, can be used as a standard.
S type thermocouple defects: 1, thermoelectric emf value is small, compensation wire error;
2. High price;
3, in the return gas environment is weak. (especially hydrogen, metal vapour)
Two, R thermocouple:
Platinum rhodium 13-Platinum thermocouple, temperature scale 0 ~ 1300℃;
Advantages of R type thermocouple:
1. Excellent heat resistance, stability, reproducibility and superior accuracy;
2. Excellent oxidation resistance and corrosion resistance;
3, can be used as a standard.
Type R thermocouple defects:
1, thermoelectric emf value is small, compensation wire error;
2, in the reducing gas environment is weak (especially hydrogen, metal vapor);
4, the price is high.
Iii. Type B thermocouple:
Platinum-rhodium 30-Platinum-rhodium 6 thermocouple, temperature scale 0 ~ 1600℃;
B type thermocouple advantages: 1, oxidation resistance, corrosion resistance and turbidity outstanding;
2. Thermoelectric EMFS are very small at room temperature, without compensating wires;
3. Better heat resistance and mechanical strength than R type.
Defects of type B thermocouple: 1. The thermoelectric emf is very small in the middle and low temperature domain, and the measurement temperature below 600℃ is not accurate;
2, thermoelectric emf value is small, thermoelectric EMF linearity is not good;
3, the price is more expensive than S degrees;
Four, K type thermocouple:
Ni-cr - Ni-Si thermocouple, temperature scale 0 ~ 1300℃;
K type thermocouple advantages: 1, the linear thermoelectric emf outstanding;
2. Excellent oxidation resistance below 1000℃;
3, in metal thermocouple safety is outstanding.
Type K thermocouple defects: 1, thermoelectric emf and precious metal thermocouple changes greatly when compared;
2, not suitable for reducing gas environment;
3. Errors may occur due to the influence of short scale sorting.
Five, N-type thermocouple:
Nickel-chromium-silicon thermocouple, temperature scale -270 ~ 1300℃;
N-type thermocouple advantages:
1. Excellent oxidation resistance below 1200℃.
2. Excellent linearity of thermoelectric emFS.
N-type thermocouple defects:
1, not suitable for reducing gas environment
2. Thermoelectric emFS vary greatly when compared with precious metal thermocouples.
Six, TYPE E thermocouple:
Nickel-chromium-silicon - constantan thermocouple, temperature scale -270 ~ 1000℃
Advantages of TYPE E thermocouple:
1. Good sensitivity in thermocouple;
2. Excellent heat resistance compared with J thermocouple;
3, suitable for oxidizing gas environment.
4, low price
Defect of type E thermocouple: not suitable for reducing gas environment
Vii. J thermocouple:
Fe-constantan thermocouple, temperature scale -210 ~ 1000℃;
Advantages of J thermocouple:
1, can be used in reducing gas environment
2. Thermoelectric EMF is 20% larger than K thermocouple.
3, the price is cheaper, suitable for medium temperature area.
J thermocouple defects: easy to rust, poor reproducibility.
Eight, T thermocouple:
Copper -- Constantan thermocouple, temperature scale -270 ~ 400℃;
T thermocouple advantages:
1. Excellent linearity of thermoelectric emFS.
2, low temperature characteristics of outstanding
3. Excellent reproducibility and high precision.
Advantages and disadvantages of T thermocouple: low temperature limit.
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