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Numerical Simulation for the Dynamic Response Calibration of the Sheathed Thermocouple |
LIU Bo1,ZHENG Wei1,WANG Zhi-yuan2,LI Xue-jing1 |
1. Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
2. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China |
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Abstract Time constant is one of the important parameters for temperature sensor`s dynamic response. Because the calibration conditions usually can`t cover the temperature sensors service conditions, the dynamic responses of a sheathed thermocouple under plunge test and loop current step response (LCSR) test were numerically simulated by the finite volume method. Three-dimensional structure models of the thermocouple with protective tube, insulating layer and sensing layer were established. The dynamic responses of the thermocouple with different MgO ratio in the insulating layer were analyzed. The results show that the time constants obtained by fitted and transformed LCSR data with the equation of three poles agree well with the time constants obtained by the plunge test, and the deviations are less than 10%. These provide a new method for the design and calibration of the fast response sheathed thermocouples.
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Received: 18 August 2021
Published: 28 December 2022
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