An Improved Methodology for the Measurement of Insulation Resistance of MIMS Thermocouples at High Temperatures: the Time-Dependent Behavior of the Insulation Resistance

Scervini M, Jones K, Laudone G, Förner A, Köbrich M, Neumeier S (2024)

Publication Type: Conference contribution

Publication year: 2024

Journal

AIP Conference Proceedings AIP Publishing

Publisher: American Institute of Physics

Book Volume: 3230

Conference Proceedings Title: AIP Conference Proceedings

Event location: Anaheim, CA US

DOI: 10.1063/5.0234190

Abstract

The current methodology suggested by technical standards for the assessment of the insulation resistance of thermocouple cables at high temperatures relies on the use of a high voltage source between the wires or between a wire and the sheath of the sensor. Such a methodology is suggested by technical standards to test the insulation resistance at both ambient temperature and high temperatures. In this paper the authors argue that an alternative methodology based on the use of a current source is preferable for the measurements of insulation resistance at high temperatures. The new methodology was applied in this work to measure the insulation resistance of type K thermocouples between 800 °C and 1300 °C. Long-term tests in both isothermal and thermal cyclic conditions were undertaken: these tests showed a time-dependent change of the insulation resistance at high temperatures, a phenomenon that had not been previously reported in the literature. Through the test results an improved understanding of the insulation breakdown and its frequency was achieved for mineral insulated metal sheathed thermocouples operating at high temperatures for prolonged time.

Authors with CRIS profile

Andreas Förner Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Manuel Köbrich Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

University of Plymouth GB United Kingdom (GB)

How to cite

APA:

Scervini, M., Jones, K., Laudone, G., Förner, A., Köbrich, M., & Neumeier, S. (2024). An Improved Methodology for the Measurement of Insulation Resistance of MIMS Thermocouples at High Temperatures: the Time-Dependent Behavior of the Insulation Resistance. In Christopher W. Meyer (Eds.), AIP Conference Proceedings. Anaheim, CA, US: American Institute of Physics.

MLA:

Scervini, M., et al. "An Improved Methodology for the Measurement of Insulation Resistance of MIMS Thermocouples at High Temperatures: the Time-Dependent Behavior of the Insulation Resistance." Proceedings of the 10th International Temperature Symposium on Temperature: Its Measurement and Control in Science and Industry, ITS 2023, Anaheim, CA Ed. Christopher W. Meyer, American Institute of Physics, 2024.

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