Calibration of Thermocouples and Infrared Radiation Thermometers by Comparison to Radiation Thermometry

Martı́n, M. J.; Zarco, M.; Campo, D. del

doi:10.1007/s10765-011-0937-7

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…To establish a series of traceable calibration points distributed across the temperature range from 0 °C up to almost 1800 °C, each participant employed complementary techniques including primary and secondary ITS-90 fixed points [30,31] (all partners), HTFPs [10] (all partners), comparison to a radiation thermometer (CEM) [32] and comparison to a Pt/Pd thermocouple (NPL). The calibrations performed are summarized in table 2 and plotted in figure 7.…”

Section: Preliminary Reference Functionmentioning

confidence: 99%

A systematic investigation of the thermoelectric stability of Pt–Rh thermocouples between 1300 °C and 1500 °C

et al. 2018

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By using a simple model to relate the electromotive force drift rate of Pt–Rh thermoelements to dS/dc, i.e. the sensitivity of the Seebeck coefficient, S, to rhodium mass fraction, c, the composition of the optimal pair of Pt–Rh wires that minimizes thermoelectric drift can be determined. The model has been applied to four multi-wire thermocouples each comprising 5 or 7 Pt–Rh wires of different composition. Two thermocouples were exposed to a temperature of around 1324 °C, one thermocouple to around 1492 °C, i.e. the melting points of the Co–C and Pd–C high temperature fixed points, respectively, and one thermocouple to a series of temperatures between 1315 °C and 1450 °C. The duration of exposure at each temperature was several thousand hours. By performing repeated calibrations in situ with the appropriate fixed point during the high temperature exposure, the drift performance has been quantified with high accuracy, entirely free from errors associated with thermoelectric homogeneity. By combining these results it is concluded that the Pt-40%Rh versus Pt-6%Rh is the most stable at the temperatures investigated. A preliminary reference function was determined and is presented.

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Section: Preliminary Reference Functionmentioning

confidence: 99%

A systematic investigation of the thermoelectric stability of Pt–Rh thermocouples between 1300 °C and 1500 °C

et al. 2018

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“…Table 1 shows the readings of the thermocouples at the calibration points with the corresponding expanded uncertainties in Table 2. The type B thermocouples were calibrated in the copper fixed point (1084.62 • C) and at another additional three points (1325 • C, 1450 • C, and 1550 • C) by comparison to a radiation thermometer; meanwhile, the Pt/Pd thermocouples were calibrated in silver (961.78 • C) and copper (1084.62 • C) fixed points and at two additional points (1325 • C and 1450 • C) by comparison to a radiation thermometer [3]. Then, a three-coefficient polynomial fitting curve was applied by the least-squares method to allow interpolation between calibration points.…”

Section: Calibration Of Thermocouplesmentioning

confidence: 99%

Assignment of $$T_{90}$$ T 90 Temperature to a Vertical Co–C Cell for Thermocouple Calibration

et al. 2014

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Noble metal thermocouples are often required to be calibrated up to 1400 • C in fixed points in order to get the lowest uncertainties. The International Temperature Scale of 1990 (ITS-90) defines the temperature of fixed points until the copper point (1084.62 • C). At higher temperatures, the metal carbon fixed points can be used, and the needed traceability to the ITS-90 is given by means of a standard radiation thermometer. This paper presents the method developed by the Centro Español de Metrologia to give traceability to the ITS-90 to the Co-C cell used to calibrate thermocouples by means of a mirror and a standard radiation thermometer with an expanded uncertainty (k = 2) of 0.5 • C.

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“…CEM has facilities for calibrating thermocouples up to 1324 °C using fixed points and up to 1600 °C by comparison to a calibrated radiation thermometer, described in detail in [29].…”

Section: Cem Facilitiesmentioning

confidence: 99%

“…To determine the relationship between temperature and emf (electro-motive force, or thermovoltage) of a thermocouple by comparison to a radiation thermometer, a three-zone horizontal furnace, constructed in-house, is used [29]. This is also powered by a dc electrical supply, and also uses MoSi 2 heating resistors.…”

Section: Cem Facilitiesmentioning

confidence: 99%

A pan-European investigation of the Pt-40%Rh/Pt-20%Rh (Land–Jewell) thermocouple reference function

Pearce¹,

Elliott²,

Greenen³

et al. 2014

Meas. Sci. Technol.

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Accurate high temperature measurement has always been problematic for industry. The vast majority of industrial temperature measurements are performed with thermocouples. The development of any new thermocouple types requires the characterization of the relationship between thermocouple output and temperature, i.e. the reference function. An important thermocouple for measuring temperatures above about 1500 °C is the so-called Land–Jewell (Pt-40%Rh/Pt-20%Rh) thermocouple. This was used as a test thermocouple for a new European distributed facility for characterizing thermocouple reference function. The facility is described, and used to generate a demonstrator reference function for the thermocouple. It is found that the demonstrator reference function differs from the de-facto standard reference function of ASTM E1750-09 by several degrees above 1500 °C; a suggested explanation for this is given.

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Calibration of Thermocouples and Infrared Radiation Thermometers by Comparison to Radiation Thermometry

Cited by 7 publications

References 6 publications

A systematic investigation of the thermoelectric stability of Pt–Rh thermocouples between 1300 °C and 1500 °C

A systematic investigation of the thermoelectric stability of Pt–Rh thermocouples between 1300 °C and 1500 °C

Assignment of $$T_{90}$$ T 90 Temperature to a Vertical Co–C Cell for Thermocouple Calibration

A pan-European investigation of the Pt-40%Rh/Pt-20%Rh (Land–Jewell) thermocouple reference function

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