A thermocouple is a commonly used temperature measuring element in a temperature measuring instrument . It directly measures the temperature, converts the temperature signal into a thermo-electromotive force signal, and converts the temperature of the measured medium through an electrical instrument (secondary instrument). Today we specifically introduce the correct choice of thermocouples, hoping to help users better use the product.
1, the measurement accuracy and temperature measurement range of the choice of the use of temperature in the 1300 ~ 1800 °C, when the required accuracy is relatively high, the general choice of B-type thermocouple; required precision is not high, the atmosphere allows tungsten thermocouple, higher than 1800 °C Tungsten-antimony thermocouples are generally used; the operating temperature is between 1000~1300°C; the required accuracy is higher; the available S-type thermocouples and N-type thermocouples; below 1000°C, generally K-type thermocouples and N-type thermocouples are used, which are lower than 400°C. E-type thermocouples are generally used; T-type galvanic couples are generally used for measurement at 250°C and negative temperatures, and T-type thermocouples are stable and have high accuracy at low temperatures.
2, the use of the choice of atmosphere S-type, B-type, K-type thermocouple suitable for strong oxidation and weak reduction atmosphere, J-type and T-type thermocouple suitable for weak oxidation and reduction atmosphere, if the use of air tightness comparison A good protection tube does not impose strict requirements on the atmosphere. Humidity sensor probe, stainless steel heating tube PT100 sensor, cast aluminum heater, heating coil fluid solenoid valve
3. Durability and Thermal Responsiveness The thermocouples with large wire diameter have good durability, but the response is slower. For thermocouples with large heat capacity, the response is slow. When the gradient temperature is large, the temperature is controlled. Temperature control is poor. It requires fast response time and requires a certain degree of durability.
4. The nature and state of the measuring object The choice of thermocouples for moving objects, vibrating objects, and high-pressure vessels requires high mechanical strength. A chemical-pollution atmosphere requires a protective tube. In the case of electrical interference, high insulation is required.
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