Realization of Ru–C Eutectic Point for Evaluation of W–Re and IrRh/Ir Thermocouples

Ogura, H.; Masuyama, S.; Izuchi, M.; Yamazawa, K.; Arai, M.

doi:10.1007/s10765-014-1825-8

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…When heated from 2000°C to 2200°C, the phenomenon of signal shunting was rst observed, when the thermocouple readings began to deviate in the negative direction from the pyrometer readings by (13)(14)(15) °C, but they shifted and were at the same time quite stable. The temperature rising to 2400 ℃ immediately revealed signi cant decrease in the thermocouple readings to minus 55 ℃ relative to the pyrometer.…”

Section: Specimen Testing In a Protective Tubementioning

confidence: 99%

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Tungsten–Rhenium Thermocouples Calibration in Ultra-High Temperature Range

Ulanovskiy¹,

Ankudinov²

2023

Int J Thermophys

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There are presented results of experimental research on calibration of tungsten-rhenium thermocouples at the temperatures exceeding the upper limit of measurements (1700 ℃) of standard type B thermocouple. The research was carried out using the high-temperature installation UKT-2500, designed for practical use in production of temperature sensors based on refractory thermocouples. The available electrical insulating materials for thermoelements have been tested in the temperature range of (1500-2500) ℃. The effects of signal shunting and thermocouples stability in an inert atmosphere have been investigated at upper limit of the operating temperature range. There was proved practical feasibility of the method for calibration of several contact temperature sensors (up to 10) in one run relative to radiation pyrometer readings. Its suitability for thermocouple calibration and certifying of thermoelement wires in the temperature range (1200-2200) ℃ was shown. Calibration of a single tungsten-rhenium thermocouple made at the reference xed point Ru-C demonstrated the highest accuracy. Using bare wire thermoelements W-Re5% and W-Re20%, type A thermocouple was calibrated in the whole measuring range from 1200 ℃ to 2500 ℃ against an accurate radiation pyrometer.

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Section: Specimen Testing In a Protective Tubementioning

confidence: 99%

“…They can reproduce the melting temperature with high accuracy. [12,13,14]. Two xed-points are suitable for calibration of W-Re-thermocouples with hafnia and sapphire insulators behind 1700 ℃: Pt-C (~ 1738 ℃) and Ru-C (~ 1954 ℃).…”

Section: Calibration Of W-re Thermocouple At the Reference Fixed-pointmentioning

confidence: 99%

Tungsten–Rhenium Thermocouples Calibration in Ultra-High Temperature Range

Ulanovskiy¹,

Ankudinov²

2023

Int J Thermophys

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“…The thermoelectric inhomogeneity characteristic was the critical research area during the W/Re thermocouple calibration [15,16]. As an initial investigation, the inhomogeneity of the W/Re thermocouple was tested at 160 • C in an oil bath and at 1100 • C in a three-zone uniform furnace separately.…”

Section: Uncertainty Budgetmentioning

confidence: 99%

Calibration of a W/Re thermocouple using Pd-C, Pt-C and Ru-C eutectic cells at NIM

Zhang

Sun

et al. 2020

Metrologia

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In the paper, an in-house W/Re thermocouple was calibrated at the eutectic fixed points of Pd-C (1492 • C), Pt-C (1738 • C) and Ru-C (1953 • C). To correct the temperature error caused by the thermal conduction of the thermocouple sheath, a linear extrapolation method was developed to determine the emf of the thermocouple based on the melting and freezing values at the eutectic fixed points realized with different offset furnace temperatures. In a simpler approach, the average of the melting and freezing values was also used. The results showed that the temperatures corresponding to the emfs derived from the linear extrapolation and the average method agreed (1-2) • C with the standard reference values of type-C thermocouple in the temperature range studied.

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“…The Ru-C eutectic point is the highest HTFP below 2000 °C and therefore is of interest not only for radiation thermometry but also for the calibration and evaluation of high-temper ature thermocouples such as W-Re and IrRh/Ir [13]. Although W-Re thermocouples are widely used in industry at temperatures up to above 2000 °C, the electromotive force (emf) of the thermocouple is known to change when exposed to elevated temperatures.…”

Section: The Ru-c Eutectic Pointmentioning

confidence: 99%

Performance of WC–C peritectic and Ru–C eutectic fixed points

Sasajima

Khlevnoy

et al. 2019

Metrologia

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Two types of high-temperature fixed points (HTFPs) were evaluated by VNIIOFI, NIM, KRISS and NMIJ. WC-C peritectic point cells manufactured independently in different National Metrology Institutes (NMIs) were compared for the first time, and agreement of the melting temperatures for three high-quality cells at the level of 0.05 °C was demonstrated. This confirms, in conjunction with previous results that verified their long-term stability, high repeatability and reproducibility, the high potential of the WC-C cell as the highesttemperature reference point for radiation thermometry.The performance of the Ru-C eutectic fixed point was verified by evaluating Ru-C cells manufactured from 99.999% purity Ru materials from different manufacturers. These cells used considerably purer materials than those used in previous studies. New Ru-C cells were constructed from the best performing materials, and the t 90 values of these cells were measured at the four NMIs on their locally-realized ITS-90 scale. The values agreed within 0.25 °C among the four NMIs, and the t 90 value of Ru-C was determined to be 1953.64 °C with an expanded uncertainty of 0.20 °C. Both results confirmed that performance of WC-C and of Ru-C is comparable to or exceeds that of the HTFPs evaluated in the Consultative Committee for Thermometry's HTFP project, and both fixed points have capability as a reference fixed points to be included in the future MeP-K in terms of thermodynamic temperature T.

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Realization of Ru–C Eutectic Point for Evaluation of W–Re and IrRh/Ir Thermocouples

Cited by 6 publications

References 8 publications

Tungsten–Rhenium Thermocouples Calibration in Ultra-High Temperature Range

Tungsten–Rhenium Thermocouples Calibration in Ultra-High Temperature Range

Calibration of a W/Re thermocouple using Pd-C, Pt-C and Ru-C eutectic cells at NIM

Performance of WC–C peritectic and Ru–C eutectic fixed points

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