Features of Co/C and Ni/C eutectic transitions for use in thermocouple thermometry

Kim, Yong-Gyoo; Yang, Inseok; Kwon, Su Yong; Gam, Kee Sool

doi:10.1088/0026-1394/43/1/010

Cited by 35 publications

(28 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Novel high-temperature fixed points based on metalcarbon eutectic alloys [1][2][3] have been shown to be high-performance temperature standards above the freezing point of Ag (962 • C), and their use could certainly reduce the scale-realization uncertainties [4] and address practical thermometry needs [5][6][7][8][9][10]. A good overview of the current state of research with respect to high-temperature fixed points (HTFP) can be found in [11].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Fixed-Point Facilities for Improved Thermocouple Calibration—Euromet Project 857

et al. 2008

View full text Add to dashboard Cite

LNE, NPL, and PTB decided in 2005 to join their research efforts in the framework of Euromet Project 857 with the aim of reducing the calibration uncertainty of noble metal and other high-temperature thermocouples by at least a factor of two. This ambitious target will be met through the development and implementation of robust high-temperature fixed points based on metal-carbon eutectic technology. The Euromet project is structured around five work packages and ensures good and efficient cooperation between the partners to meet the objectives within the project timeframe of four years. Furthermore, a formal cooperative research agreement has been established with the National Metrology Institute of Japan (NMIJ) to demonstrate, on a worldwide basis, that this new method is a significant improvement over current calibration methods. In summary, the project consists of (a) the development of sets of cells at the cobalt-carbon eutectic point (1,324 • C) and palladium-carbon eutectic point (1,492 • C) and (b) the construction of platinum/palladium (Pt/Pd) thermocouples carefully stabilized for use to these temperatures. Supplementary research to be undertaken as part of this project is the improvement of fixed-point construction and realization capabilities through high-temperature furnaces with low thermal gradients. This paper describes the European project and gives an overview of current progress.

show abstract

Section: Introductionmentioning

confidence: 99%

High-Temperature Fixed-Point Facilities for Improved Thermocouple Calibration—Euromet Project 857

et al. 2008

View full text Add to dashboard Cite

show abstract

“…especially of thermocouples, was recognized [5][6][7][8]. The actual calibration uncertainty of thermocouples at temperatures higher than the freezing point of copper (1,084.62 • C) rises from about ±0.3 K at 1,100 • C to about ±1.5 K at 1,550 • C [9], due to the absence of reliable high-temperature fixed points in this temperature range.…”

mentioning

confidence: 99%

Construction and Investigation of Pt/Pd Thermocouples in the Framework of the Euromet Project 857

2008

View full text Add to dashboard Cite

The objective of the EUROMET Project 857 in the field of thermometry, "High-temperature fixed points for improved thermocouple calibrations," is the development of robust high-temperature fixed points based on metal-carbon eutectic alloys for the calibration of thermocouples above 1,084 • C. This paper describes the construction and investigation of Pt/Pd thermocouples to be used to compare different cobalt-carbon (Co-C) fixed-point cells constructed by the three participants of this project. A set of three Pt/Pd thermocouples was prepared by PTB and NPL and a set of four by LNE. Their metrological performances in terms of thermoelectric stability and homogeneity were assessed in different ways. The results of these investigations, as well as the results of first measurements of local Co-C eutectic fixed-point cells by using Pt/Pd thermocouples, are presented.

show abstract

“…After evacuating the tube to 1.3 Pa, pure argon (99.999 %) with a volume fraction of 0.5 % hydrogen was admitted to the cell. The internal pressure was kept slightly higher than an ambient level [2,4].…”

Section: Methodsmentioning

confidence: 99%

“…These points can be used to calibrate thermometers or to check the linearity of a radiation thermometer. Particularly Fe-C, Co-C, Pd-C, and Pt-C eutectic points have been widely investigated for the calibration of thermocouples [1][2][3][4][5][6]. In addition, international comparisons of the M-C points by using thermocouples as transfer artifacts are in progress at EUROMET and the APMP [7].…”

Section: Introductionmentioning

confidence: 99%

Realization of Fe–C Eutectic Point Using an Alumina Crucible

2010

View full text Add to dashboard Cite

As another crucible material for metal-carbon eutectic points, alumina ceramic was used in the first trial to make an Fe-C eutectic point for the calibration of a thermocouple. Its melting and freezing behavior was tested 26 times with a type S thermocouple at various melting offset temperatures, namely, +4 • C, +9 • C, and +19 • C, and at a fixed freezing offset temperature of −11 • C. The melting emf is reproducible independent of the melting offset temperatures, and the standard deviation of the 26 melting temperatures is 0.02 • C without breakage of the cell. The difference of melting emf between alumina Fe-C and graphite Fe-C fixed points is only 25 mK within an uncertainty of 0.39 • C (k = 2). The melting behaviors of an alumina cell are quite similar to a common graphite cell. Thus, alumina can be used as a crucible material in an Fe-C eutectic system without breakage, and it can be used at a higher temperature range. As possible application systems using alumina crucibles, Pd-C and Si-SiC eutectic points are suggested.

show abstract

Features of Co/C and Ni/C eutectic transitions for use in thermocouple thermometry

Cited by 35 publications

References 8 publications

High-Temperature Fixed-Point Facilities for Improved Thermocouple Calibration—Euromet Project 857

High-Temperature Fixed-Point Facilities for Improved Thermocouple Calibration—Euromet Project 857

Construction and Investigation of Pt/Pd Thermocouples in the Framework of the Euromet Project 857

Realization of Fe–C Eutectic Point Using an Alumina Crucible

Contact Info

Product

Resources

About