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8 results for “thermocouple”
Correlation Between Insulation Resistance and Temperature Measurement Error in Type K and Type N Mineral Insulated, Metal Sheathed Thermocouples
<p>Mineral insulated, metal sheathed (MI) Type K and Type N thermocouples are<br> widely used in industry for process monitoring and control. One factor that limits<br> their accuracy is the dramatic decrease in the insulation resistance at temperatures<br> above about 600 °C which results in temperature measurement errors due to electrical<br> shunting. In this work the insulation resistance of a cohort of representative MI<br> thermocouples was characterised at temperatures up to 1160 °C, with simultaneous<br> measurements of the error in indicated temperature by in situ comparison with a reference<br> Type R thermocouple. Intriguingly, there appears to be a systematic relationship<br> between the insulation resistance and the error in the indicated temperature. At<br> a given temperature, as the insulation resistance decreases, there is a corresponding<br> increasingly negative error in the temperature measurement. Although the measurements<br> have a relatively large uncertainty (up to about 1 °C in temperature error and<br> up to about 10 % in insulation resistance measurement), the trend is apparent at all<br> temperatures above 600 °C, which suggests that it is real. Furthermore, the correlation<br> disappears at temperatures below about 600 °C, which is consistent with the<br> well-established diminution of insulation resistance breakdown effects below that<br> temperature. This raises the intriguing possibility of using the as-new MI thermocouple<br> calibration as an indicator of insulation resistance breakdown: large deviations<br> of the electromotive force (emf) in the negative direction could indicate a correspondingly<br> low insulation resistance.</p>
Thermocouple inhomogeneity data underpinning the recommendations given in Euramet Calibration Guide No. 8 Version 3.0
<p>Thermoelectric inhomogeneity data from diverse sources, compiled to inform the advice given in Euramet Calibration Guide No. 8 concerning the uncertainty to assume from inhomogeneity.</p> <p>Filename indicates file type; data is the magnitude of the inhomogeneity, in units of °C.</p> <p>More details can be found in the publication Meas. Sci. Technol. 29 (2018) 067002, https://doi.org/10.1088/1361-6501/aabaa3.</p> <p> </p>
Drift of Pt-Rh thermocouples in emf and in temperature terms at 1324 °C
<p>Dataset containing drift of selected Pt-Rh thermocouples which are part of a multi-wire thermocouple. Drift is in emf terms and in temperature terms. Drift was measured by exposing the thermocouples to a temperature of approximately 1324 °C, with periodic in-situ calibration using a Co-C 'fixed-point' point cell (melting point 1324.29 °C).</p>
Pt‑40%Rh Versus Pt‑6%Rh Thermocouples: An emf‑Temperature Reference Function for the Temperature Range 0 °C to 1769 °C
<p>Data for the associated paper, DOI https://doi.org/10.1007/s10765-021-02895-w</p> <p>The paper describes the metrological characterization of the highly stable Pt40%Rh/Pt-6%Rh thermocouples to determine their reference function in the temperature range between 0 °C and 1769 °C. The preparation of the Pt-40%Rh/Pt-6%Rh thermocouples is described, as well as the measurement procedures and the measurement results of comparison and fxed point measurements for the determination of the reference function with low uncertainties.</p>
Temperature measurements of full-scale wall element using Type K thermocouples to observe internal convection in loose-fill wood fiber insulation
<p>Internal convection of insulation materials is a phenomenon that occurs when a construction element is subjected to a temperature difference on either side of the element, as the temperature difference inside the insulation will facilitate an onset of air movement due to thermal buoyancy. This dataset represents the results of 11 unique experiments conducted at Aalborg University at the Department of the Built Environment, where a full-scale wall element insulated with loose-fill wood fiber insulation is investigated for internal convection. A large guarded hotbox is used to control the boundary conditions of either side of the wall element, to imitate a construction element subjected to external and internal boundary conditions, similar to a wall in a house. This dataset can be used to benchmark other insulation materials investigated at similar boundary conditions.</p> <p>The dataset is structured into steady-state experiments and dynamic experiments, where a total of 7 unique cases are conducted in steady-state conditions, and 4 unique cases are conducted in dynamic conditions. The dataset for the steady-state experiments is structured by the temperature difference that the full-scale wall element is exposed to, from the cold and hot side, while the dynamic experiments are structured by the amplitude of the temperature variation, along with if an artificial sun is used or not.</p> <p>The results for the internal convection of the loose-fill wood fiber insulation show similar results as other studies that have conducted experiments on other insulation materials.</p> <p>For more information, see doi: 10.54337/aau488363266</p>
A validated physical model of the thermoelectric drift of Pt-Rh thermocouples above 1200 °C
<p>Data associated with a validated physical model of the thermoelectric drift of Pt-Rh thermocouples above 1200 °C (Metrologia 57 (2020) 025009) https://doi.org/10.1088/1681-7575/ab71b3</p>
Mass Loss of Platinum-Rhodium Thermocouple Wires at 1324°C
<p>Data associated with publication https://doi.org/10.1595/205651321X16183288904988 </p>
Raman spectroscopic data from tube furnace and natural wildfire Calluna charcoals, with accompanying wildfire thermocouple data.
<p>These datasets include Raman spectral parameters collected from <strong>a)</strong> tube furnace-pyrolysed charcoals, made from <em>Calluna vulgaris</em> (Ling Heather) at 400, 600, 800 and 1000 degrees centigrade, and <strong>b)</strong> wildfire charcoals (<em>Calluna vulgaris</em>) produced and collected during a prescribed heathland burn in Aberdeenshire, Scotland. Accompanying these data includes thermocouple (fire temperature) readings from the heathland fire, corresponding directly to charcoal samples analysed using Raman spectroscopy (b). </p> <p>With regards to the derivation of this Raman data, deconvolution utilising two first order bands (D & G) was implemented, and median values for each spectrum were produced. Following this, D- and G-band width (FWHM), intensity (ID/IG or 'R1') and area (AD/AG) ratios, band separation (G-D or 'RBS'), and band width ratio (FWHMRa) parameters were calculated and applied. For geothermometry of wildfire charcoals, a linear equation was determined from FWHMRa median values - produced by the spectroscopy of tube furnace charcoals between 400 and 1000 degrees centigrade (a).</p>
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