scholarly journals A Software Improvement Technique for Platinum Resistance Thermometers

Instruments ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 15 ◽  
Author(s):  
Andrew Chen ◽  
Hsuan-Yu Chen ◽  
Chiachung Chen
Keyword(s):  
High Sensitivity ◽  
Microprocessor System ◽  
Platinum Resistance ◽  
Long Term Stability ◽  
Accuracy And Precision ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers ◽  
Temperature Ranges ◽  
The Difference ◽  
Calibration Equations

Temperature measurement is essential in industries. The advantages of resistance temperature detectors (RTDs) are high sensitivity, repeatability, and long-term stability. The measurement performance of this thermometer is of concern. The connection between RTDs and a novel microprocessor system provides a new method to improve the performance of RTDs. In this study, the adequate piecewise sections and the order of polynomial calibration equations were evaluated. Systematic errors were found when the relationship between temperature and resistance for PT-1000 data was expressed using the inverse Callendar-Van Dusen equation. The accuracy of these calibration equations can be improved significantly with two piecewise equations in different temperature ranges. Two datasets of the resistance of PT-1000 sensors in the range from 0 °C to 50 °C were measured. The first dataset was used to establish adequate calibration equations with regression analysis. In the second dataset, the prediction temperatures were calculated by these previously established calibration equations. The difference between prediction temperatures and the standard temperature was used as a criterion to evaluate the prediction performance. The accuracy and precision of PT-1000 sensors could be improved significantly with adequate calibration equations. The accuracy and precision were 0.027 °C and 0.126 °C, respectively. The technique developed in this study could be used for other RTD sensors and/or different temperature ranges.

THE FREEZING POINTS OF HIGH PURITY METALS AS PRECISION TEMPERATURE STANDARDS: I. PRECISION MEASUREMENTS WITH STANDARD RESISTANCE THERMOMETERS

1957 ◽  
Vol 35 (1) ◽  
pp. 78-90 ◽  
Author(s):  
E. H. McLaren
Keyword(s):  
Triple Point ◽  
Cold Work ◽  
Platinum Resistance ◽  
Intrinsic Resistance ◽  
Long Term Stability ◽  
Resistance Bridge ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers ◽  
Precision Temperature

The techniques and difficulties encountered in measuring temperatures to the highest precision with platinum resistance thermometers are discussed. It is shown that the relative drift of the resistance coils in the Mueller resistance bridge used for these measurements is less than a part per million per year. The intrinsic resistance of a platinum thermometer is comparatively unstable, and results showing some effects of cold work and heat treatment on several thermometers are given.As each precision temperature determination involves the resistance of the thermometer at the triple point of water, extensive measurements have been carried out to obtain information on: (a) the reproducibility of temperature in particular cells, (b) the variation in temperature among cells, and (c) the long term stability of cell temperatures.The limiting uncertainties in temperature measurements due to variation in the bridge, the thermometers, and the triple point cells are each of the order of 10−4 °C.

I. On a determination of the boiling point of sulphur, and on a method of standardising platinum resistance thermometers by reference to it

1891 ◽  
Vol 49 (296-301) ◽  
pp. 56-60
Keyword(s):  
Accurate Method ◽  
Platinum Resistance Thermometer ◽  
Platinum Resistance ◽  
Resistance Thermometer ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers ◽  
Wide Range ◽  
The Difference ◽  
Relative Measurements

Experiments by different observers have shown that electrical resistance thermometers afford the most convenient and accurate method of measuring temperature through a very wide range. By selecting a particular thermometer as the standard, and directly comparing others with it, it has been found possible to attain a degree of accuracy of the order of 0°·001 in the relative measurements between 0° and 100°C., and of the order of 0º·01 at 450°C. In a previous communication* it has been shown that, if t be the temperature by air thermometer, and if pt be the temperature by platinum resistance thermometer, the difference between them is very closely represented from 0° to 700°C. by the formula d = t - pt = δ { t /100│ 2 — - t /100} ... ( d ).

scholarly journals XI. On the high-temperature standards of the National Physical Laboratory: An account of a comparison of platinum thermometers and thermojunctions with the gas thermometer

1904 ◽  
Vol 203 (359-371) ◽  
pp. 343-384 ◽  
Keyword(s):  
Boiling Point ◽  
National Physical Laboratory ◽  
Platinum Resistance ◽  
Physical Laboratory ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers ◽  
Difference Formula ◽  
Series Of Experiments ◽  
The Difference ◽  
Normal Scale

In a paper “On the Comparison of Gas and Platinum Thermometers,” read before the Royal Society in 1900, Dr. P. Chappuis and the author described a series of experiments in which several platinum-resistance thermometers, constructed of wire of specially high purity, were compared with the gas thermometer at a number of steady temperatures from below zero to above the boiling-point of sulphur, and in one set of measurements to just short of 600°C. The results were such as to substantially confirm the conclusion of Callendar and Griffiths that the indications of platinum thermometers may he reduced to the normal scale by the employment of Callendar’s well-known difference formula d ≡ T- pt =δ [(T/100) 2 - T/100] where d = the difference between T, the temperature on the normal scale, and pt = the “platinum” temperature. The constant δ for pure platinum wires is approximately 1.5, the three temperatures chosen for its determination being 0°, 100° and the boiling-point of sulphur.

Certifying precision platinum resistance thermometers

1990 ◽  
Vol 33 (6) ◽  
pp. 586-588
Author(s):  
S. L. Knina ◽  
A. A. Nechai ◽  
A. A. Semenov ◽  
V. A. Petrushina ◽  
A. I. Pokhodun
Keyword(s):  
Platinum Resistance ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers
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