Thermocouple temperature transducer error of thermal inertia is introduced into the solution

Due to thermal inertia of thermocouple gauges behind the change of the measured temperature, indicating value of this influence is particularly acute in rapid measurement. With thermocouple time constant is inversely proportional to the heat transfer coefficient, the diameter, material density and specific heat is proportional to the, to reduce the time constant, in addition to the increased heat transfer coefficient, the most effective way is to do the temperature transmitter amount to decrease the size of hot whole. When using the time constant of thermocouple temperature or temperature control, instrument display of temperature fluctuation is small, but the actual furnace temperature fluctuations can be quite large. This also leads to measure hysteresis, the greater the thermocouple, the smaller the fluctuation amplitude is and the actual temperature difference. Because there is measurement lag, using thermocouples detect temperature fluctuations of the amplitude is relatively small temperature fluctuation amplitude of the temperature transmitter.

typically USES the material with good thermal conductivity function, thin, small diameter of the tube wall to protect casing. In the precision of temperature measurement, using unprotected casing bare wire hot thermocouple temperature transmitter, thermocouple damaged easily, but should be timely correction and replacement. Temperature measuring environmental permits, even protecting tube can be taken. To correct measurement of temperature, should choose the thermocouple time constant small.