The thermal inertia of the temperature sensor is actually the thermal inertia of the temperature sensor or the thermal inertia of the thermocouple. Due to the thermal inertia or the thermal inertia of the thermocouple, the indication value of the meter lags behind the measured temperature. This effect is especially true when making rapid measurements. prominent. Therefore, a thermal resistor or a thermocouple with a thinner hot electrode and a smaller diameter of the protective tube should be used as much as possible. When the temperature measurement environment permits, the protection tube can even be removed. Due to the measurement lag, the amplitude of the temperature fluctuation detected by the thermal resistance or the thermocouple is smaller than the amplitude of the furnace temperature fluctuation. The larger the measurement hysteresis, the smaller the amplitude of the thermal resistance or thermocouple fluctuation, and the greater the difference from the actual furnace temperature. When the temperature is measured or controlled by a thermocouple with a large time constant, although the temperature displayed by the meter fluctuates little, the fluctuation of the actual furnace temperature may be large. In order to accurately measure the temperature, a thermal resistor or thermocouple with a small time constant should be selected. The time constant is inversely proportional to the heat transfer coefficient, and is proportional to the diameter of the thermal resistance or the hot end of the thermocouple, the density of the material, and the specific heat. To reduce the time constant, in addition to increasing the heat transfer coefficient, the most effective way is to minimize The size of the hot end. In use, it is usually a material with good thermal conductivity, a protective tube with a thin tube wall and a small inner diameter. In the more precise temperature measurement, a bare wire thermal resistance or thermocouple without a protective sleeve is used, but the thermocouple is easily damaged and should be corrected and replaced in time.
The error caused by the thermal inertia of the temperature sensor has a great influence on the measured value during the measurement. Especially in the precision measurement, the thermal inertia of the sensor must be paid attention to. We should try to avoid the error caused by thermal inertia or take appropriate compensation to weaken it. This kind of error.
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