Measuring range and characteristics of various thermocouple thermal resistances with indexing numbers
First, the S-type thermocouple: platinum rhodium 10-platinum thermocouple, temperature range 0 ~ 1300 °C; Advantages: 1, heat resistance, stability, good reproducibility and superior accuracy;
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Item NO. :WWDP-12
Size : 0.35L/0.5L/0.8L/1L/1.5L
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2, good resistance to oxidation and turbidity;
3, can be used as a standard.
Disadvantages: 1, the value of the thermal EMF is small, the error of the compensation wire is large;
2, the price is high;
3. It is relatively fragile in the restitution gas environment. (especially hydrogen, metal vapors)
Second, the R-type thermocouple: platinum rhodium 13-platinum thermocouple, the temperature range of 0 ~ 1300 °C;
Advantages: 1, heat resistance, stability, good reproducibility and superior accuracy;
2, good resistance to oxidation and turbidity;
3, can be used as a standard.
Disadvantages: 1, the value of the thermal EMF is small, the error of the compensation wire is large;
2. It is relatively fragile in the restitution gas environment (especially hydrogen, metal vapor);
4, the price is higher than the S index.
Third, B-type thermocouple: platinum crucible 30 - platinum crucible 6 thermocouple, temperature range 0 ~ 1600 °C;
Advantages: 1. Good resistance to oxidation and turbidity;
2. The thermal electromotive force is very small under normal temperature environment, and no compensation of wires is required;
3, heat resistance and mechanical strength are better than R type.
Disadvantages: 1, in the low-temperature domain of the thermal EMF is extremely small, the measured temperature is not accurate below 600 °C;
2. The value of the thermo-electromotive force is small, and the linearity of the thermo-electromotive force is not good;
3, the price is more expensive than the S index;
Fourth, K-type thermocouple: nickel-chromium-nickel-silicon thermocouple, temperature range 0 ~ 1300 °C;
Advantages: 1. The linearity of the thermal emf is good;
2. Good oxidation resistance below 1000°C;
3. The stability in metal thermocouples is good.
Disadvantages: 1. The thermo-electromotive force changes greatly when compared with precious metal thermocouples;
2, does not apply to restitution gas environment;
3, the impact of short-range sorting will produce errors.
Fifth, N-type thermocouple: nickel-chromium silicon - nickel-silicon thermocouple, the temperature range of -270 ~ 1300 °C;
Advantages: 1, 1200 °C below good oxidation resistance.
2. The linearity of thermal emf is good.
Disadvantages: 1, does not apply to the restitution gas environment 2, the thermo-electromotive force and the precious metal thermocouple compared to a larger change.
Six, E-type thermocouple: nickel-chromium silicon - Constantin thermocouple, temperature range -270 ~ 1000 °C
Advantages: 1, the best sensitivity of the thermocouple;
2, compared with J thermocouple heat resistance is good;
3, suitable for oxidizing gas environment.
4, the low price disadvantage: does not apply to restitution gas environment seven, J-type thermocouple: iron - Constantan thermocouple, temperature range -210 ~ 1000 °C;
Advantages: 1, can be used for restitution gas environment 2, thermal emf than K thermocouple 20%.
3, the price is cheaper, apply to the temperature zone.
Disadvantages: easy to rust, poor reproducibility.
Eight, T-type thermocouple: Copper - Constantan thermocouple, temperature range -270 ~ 400 °C;
Advantages: 1. The linearity of the thermo-electromotive force is good.
2, good low temperature characteristics 3, good reproducibility, high precision.
Disadvantages: 1, the use of low temperature limits.
