A thermocouple is a commonly used temperature measuring component in a temperature measuring instrument. It directly measures the temperature and converts the temperature signal into a thermoelectromotive force signal, which is converted into the temperature of the measured medium by an electric meter (secondary meter). Today we will introduce the correct selection method of thermocouples, hoping to help users better apply products.
1. Measurement accuracy and temperature measurement range The selection temperature is 1300~1800Â°C. When the required precision is relatively high, B type thermocouple is generally used. The precision is not high, and the atmosphere allows for the use of tungsten-rhodium thermocouple, higher than 1800Â°C. Tungsten-rhenium thermocouples are generally used; S-type thermocouples and N-type thermocouples are available with high accuracy at 1000~1300Â°C; K-type thermocouples and N-type thermocouples are generally used below 1000Â°C, below 400Â°C E-type thermocouples are generally used; T-type galvanic couples are generally used for measurement at 250 Â° C and negative temperature, and T-type thermocouples are stable and highly accurate at low temperatures.
2. Selection of atmospheres S-type, B-type, and K-type thermocouples are suitable for use in strong oxidation and weak reducing atmospheres. J-type and T-type thermocouples are suitable for weak oxidation and reducing atmospheres. A good protection tube, the requirements for the atmosphere are not too strict. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating coil fluid solenoid valve
3. Durability and thermal responsiveness The thermocouple with large diameter has good durability, but the response is slower. For thermocouples with large heat capacity, the response is slow. When measuring the temperature of the gradient, in the case of temperature control. The temperature control is poor. Requires a fast response time and requires a certain degree of durability.
4. The nature and state of the measuring object The selection of the thermocouple The moving temperature of the moving object, the vibrating object and the high-pressure container requires high mechanical strength. The atmosphere with chemical pollution requires a protective tube. In the case of electrical interference, the insulation is required to be relatively high.
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