Thermocouple temperature measurement, measured value and actual value compared to a great deviation, what is the reason?
Error due to nonuniformity of thermocouple material:This error is related to the degree of inhomogeneity of materials. The greater the temperature variation, the greater the difference in temperature at each point of the thermoelectric pole, the greater the inhomogeneity of the material. Solution: it can be reduced by annealing, but it can not be completely eliminated.
Basic error of thermocouple:The error is inherent in the thermocouple itself and includes the standard deviation of the upper pole. Solution: the method of verification and verification can be used to control the allowable deviation range, and the correct deviation of thermocouple can be corrected in actual temperature measurement.
Error of measuring instrument:The magnitude of the error is determined by the accuracy of the instrument.
