Precautions for selecting thermocouples

The selection of a thermocouple should be based on comprehensive considerations such as the use temperature range, the required accuracy, the use atmosphere, the performance of the measurement object, the response time and the economic benefits. 1. Selection of measurement accuracy and temperature measurement range. When the temperature is between 1300~1800℃ and the accuracy is relatively high, the B-type thermocouple is generally used; the accuracy is not high, and the atmosphere allows the use of tungsten rhenium thermocouple, higher than 1800℃ Tungsten-rhenium thermocouple is generally used; the working temperature is 1000~1300℃, and the accuracy is relatively high. S-type thermocouple and N-type thermocouple are available; K-type thermocouple and N-type thermocouple are generally used below 1000℃, below 400℃ E-type thermocouple is generally used; T-type thermocouple is generally used for measurement at 250°C and negative temperature. T-type thermocouple is stable and high in accuracy at low temperatures. 2. The choice of using atmosphere. S-type, B-type and K-type thermocouples are suitable for use in strong oxidizing and weak reducing atmospheres. J-type and T-type thermocouples are suitable for weak oxidizing and reducing atmospheres. A good protection tube has less strict requirements on the atmosphere. 3. Selection of durability and thermal responsiveness. Thermocouples with larger wire diameters have better durability, but have a slower response. For thermocouples with large heat capacity, the response is slow. When measuring temperatures with large gradients, under temperature control , The temperature control is poor. It requires a fast response time and a certain degree of durability, so it is more appropriate to choose an armored couple. 4. The nature and state of the measurement object and the selection of thermocouples. The temperature measurement of moving objects, vibrating objects, and high-pressure vessels requires high mechanical strength. Chemically polluted atmospheres require protective tubes. In the case of electrical interference, higher insulation is required. 5. Matters needing attention Nominal pressure of thermocouple: generally refers to the static external pressure that the protective tube can withstand at working temperature and breaks. Thermocouple is very small insertion depth: should not be less than 8-10 times the outer diameter of its protective tube (except for special products) Insulation resistance: when the surrounding air temperature is 15-35℃, relative humidity

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