scholarly journals Evaluation of the temperature scale of SPRT calibrated at the triple point of sulfur hexafluoride

2021 ◽  
Vol 18 ◽  
pp. 100211
Author(s):  
Yasuki Kawamura ◽  
Tohru Nakano
Keyword(s):  
Triple Point ◽  
Sulfur Hexafluoride ◽  
Temperature Scale

scholarly journals The succinonitrile triple-point standard: a fixed point to improve the accuracy of temperature measurements in the clinical laboratory.

1983 ◽  
Vol 29 (7) ◽  
pp. 1380-1384 ◽  
Author(s):  
B W Mangum
Keyword(s):  
Fixed Point ◽  
Triple Point ◽  
Temperature Scale ◽  
Clinical Laboratory ◽  
Freezing Behavior ◽  
Temperature Measurements ◽  
Point Temperature ◽  
Practical Temperature ◽  
Practical Temperature Scale ◽  
Triple Point Temperature

Abstract In an investigation of the melting and freezing behavior of succinonitrile, the triple-point temperature was determined to be 58.0805 degrees C, with an estimated uncertainty of +/- 0.0015 degrees C relative to the International Practical Temperature Scale of 1968 (IPTS-68). The triple-point temperature of this material is evaluated as a temperature-fixed point, and some clinical laboratory applications of this fixed point are proposed. In conjunction with the gallium and ice points, the availability of succinonitrile permits thermistor thermometers to be calibrated accurately and easily on the IPTS-68.

Realization and evaluation of the triple point of sulfur hexafluoride

Metrologia ◽  
2021 ◽  
Author(s):  
Ting Li ◽  
Jianping Sun ◽  
Hongjun Wang ◽  
Inseok Yang ◽  
Xiaopeng Hao ◽  
...  
Keyword(s):  
Triple Point ◽  
Sulfur Hexafluoride

scholarly journals The triple point of sulfur hexafluoride

Metrologia ◽  
2016 ◽  
Vol 53 (2) ◽  
pp. L1-L6 ◽  
Author(s):  
P M C Rourke
Keyword(s):  
Triple Point ◽  
Sulfur Hexafluoride

scholarly journals Realizations of the Triple Point of Sulfur Hexafluoride in Transportable and Refillable Cells

2018 ◽  
Vol 123 ◽  
Author(s):  
Weston L. Tew ◽  
Klaus N. Quelhas
Keyword(s):  
Triple Point ◽  
Sulfur Hexafluoride ◽  
Weighted Average ◽  
Pressure Head ◽  
Initial Slope ◽  
Platinum Resistance ◽  
First Results ◽  
Near Term ◽  
Static Head ◽  
Immersion Type

The Minamata Convention on Mercury has created a near-term need to develop alternative fixed points to replace the mercury triple point (Hg TP) for calibration of standard platinum resistance thermometers (SPRTs) on the International Temperature Scale of 1990 (ITS-90). The sulfur hexafluoride (SF6) TP is a good candidate to provide adequate “drop-in compatible” replacements for the lowest costs. We report our first results of SF6 TP realizations performed at the National Institute of Standards and Technology (NIST) using a new series of transportable and refillable triple-point cells. The melting curves are presented at various melted fractions F and compared to evaluate the reproducibility and overall uncertainty for the realizations. We obtained a TP temperature of 223.55587(33) K at F = 50 % and 223.55607(35) K at F = 100 % as a weighted average of realizations using two adiabatic-type cells and two immersion-type cells. (Unless otherwise stated, uncertainties are standard uncertainties corresponding to a 68 % confidence level.) Temperatures were derived using a combination of five different SPRTs as calibrated at NIST on the ITS-90. The data were evaluated over a region of the melting plateau for melted fraction F between 30 % ≤ F ≤ 80 % with a 0.2 mK wide melting range. The results from the immersion-type cells were used to derive an experimental value for the SF6 TP static head correction of −11.6(1.7) mK/m. This value implies an initial slope of the pressure-temperature (p-T) equilibrium melting line of 1.55 MPa/K, whichis in agreement with the value predicted via the Clapeyron equation. The uncertainties of these initial SF6 TP realizations are limitedby uncertainty in the realization of the ITS-90 (0.25 mK) and, to a lesser extent, static pressure head effects and chemical impurities.

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