Cobalt–Carbon Eutectic Fixed Point for Contact Thermometry

Todd, A. D. W.; Gotoh, Masahiko; Woods, D.; Hill, Kathryn

doi:10.1007/s10765-010-0907-5

Cited by 10 publications

(3 citation statements)

References 16 publications

(10 reference statements)

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“…The ITS-90 temperature value was determined as (1323.99 ± 0.52) ºC (k = 2) for Co-C and (1490.69 ± 0.88) ºC (k = 2) for Pd-C by means of a Pt/Pd thermocouple calibrated at the freezing temperatures of Sn, Zn, Al, Ag, and Au. Further details regarding the furnace and the Co-C and Pd-C eutectic cells used in this investigation can be found in prior publications [2,3]. Figure 1 shows the typical temperature distribution of the furnace used in the study.…”

Section: Methodsmentioning

confidence: 99%

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Assessment of tungsten/rhenium thermocouples with metal-carbon eutectic fixed points up to 1500°C

Gotoh¹

2013

AIP Conference Proceedings

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Four Type A thermocouples and two Type C thermocouples were calibrated at the Au fixed point and Co-C and Pd-C eutectic fixed points. The thermocouples were exposed to 1330 ºC for a total of 100 hours. The maximum drift due to the exposure was found to be 4.8 ºC. The fixed-point calibration EMF of these thermocouples deviated by less than 0.86% from the temperature specified by the standards ASTM E230-2003 for Type C and GOSTR 8.585-2001 for Type A. The length of one of Type A thermocouples A52 is longer than the others by 150mm. Making use of this provision it was possible to place annealed part of A52 to the temperature gradient part of calibration arrangement every time. Therefore observed aging effect was as low as 0.5 ºC compared to the other thermocouples.

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Section: Methodsmentioning

confidence: 99%

“…The uncertainty estimations of the Co-C and Pd-C eutectic cells are based on prior publications [2,3]. O.Ongrai1 and J. V. Pearce et.al [4] report 0.5ºC (k=2) at 1324ºC excluding the thermoelectric inhomogeneity because always the same insertion length is used.…”

Section: Drift From Exposure To High Temperaturementioning

confidence: 99%

Assessment of tungsten/rhenium thermocouples with metal-carbon eutectic fixed points up to 1500°C

Gotoh¹

2013

AIP Conference Proceedings

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“…In the temperature range between the copper point and the palladium point, the melting temperature of cobalt-carbon eutectic point (Co-C, 1324 °C) is considered as a useful practical fixed point for an accurate calibration of thermocouple [2][3][4][5][6][7][8]. If the eutectic point is applicable, the uncertainty of reference thermocouples for comparison method around 1300 °C in industry would be remarkably improved.…”

Section: Introductionmentioning

confidence: 99%

The reliability of calibration for thermocouples in industry at around 1300 °C

Ogura¹,

Numajiri²,

Kobayashi³

2013

AIP Conference Proceedings

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Recently, the eutectic points are being studied by many national institutes, and considered being useful for the calibration laboratories in industry to improve their uncertainty of thermocouple calibration at high temperature. To conduct a cooperative research for investigation on the reliability of thermocouple calibration in industry at high temperature, a working group has been established within the Japan Society for the Promotion of Science (JSPS). AIST and nine domestic laboratories participated to this working group. In this working group, thermocouple comparison measurements were performed at around 1300 °C in nine laboratories by using two Pt/Pd thermocouples and one type R thermocouple following calibration at Co-C eutectic point. It was found that the uncertainties of calibration at around 1300°C in industry would be improved by utilizing the calibration at Co-C eutectic point.

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