The selection of thermocouples should be based on comprehensive considerations such as the operating temperature range, the required accuracy, the operating atmosphere, the performance of the measured object, the response time and the economic benefits.
1. Selection of measurement accuracy and temperature measurement range
1) When the operating temperature is 1300-1800 °C, and the accuracy is relatively high, type B thermocouple is generally selected;
2) The operating temperature is higher than 1800°C, the accuracy is not high, and the atmosphere is allowed to use tungsten-rhenium thermocouples, and tungsten-rhenium thermocouples are generally selected;
3) When the operating temperature is 1000-1300°C, and the accuracy is relatively high, S-type thermocouple and N-type thermocouple can be used;
4) K type thermocouple and N type thermocouple are generally used below 1000°C;
5) Below 400°C, E-type thermocouple is generally used;
6) T-type thermocouple is generally used for 250°C and negative temperature measurement, and the T-type thermocouple is stable and high accuracy at low temperature.
2. The choice of atmosphere
Type S, Type B and Type K thermocouples are suitable for use in strong oxidation and weak reducing atmosphere;
Type J and Type T thermocouples are suitable for weak oxidizing and reducing atmospheres, and if a protective tube with good air tightness is used, the requirements for the atmosphere are not too strict.
3. Selection of durability and thermal response
Thermocouples with large wire diameters have good durability but have a slower response, and for thermocouples with large heat capacity, the response is slow, and when measuring temperatures with large gradients, the temperature control is poor in the case of temperature control. It is more appropriate to choose an armored puppet if the response time is fast and a certain durability is required.
4. The selection of thermocouples for the nature and state of the measurement object
The temperature measurement of moving objects, vibrating objects and high-pressure vessels requires high mechanical strength, the atmosphere with chemical pollution requires protective pipes, and the insulation is relatively high in the case of electrical interference.
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