Tests of the Stability of Chinese RhFe Resistance Thermometers at Low Temperatures

International Journal of Thermophysics, Apr 2017

Rhodium–iron resistance thermometers are recommended as precise thermometers at temperatures below 25 K. The thermometers were developed at the National Physical Laboratory and produced by H. Tinsley and Co Ltd almost 50 years ago. Later, they were made by other companies and institutes as well, but despite this, the availability of the thermometers decreased and a new source of supply was needed. Several years ago, the Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences, developed its own technology for making wire of Rh-0.5 at% Fe alloy which was used in the production of new thermometers. These devices have been tested previously at INRIM (Italy) and later at INTiBS (Poland). INTiBS has carried out an investigation focused on the thermometers’ stability after thermal cycling treatment. This paper presents the results of stability tests of about 30 thermometers produced by TIPC in two batches. The resistance of each thermometer was measured at temperatures of about 4.6 K and 7.2 K before and after 10, 30 and 50 thermal cycles from room temperature. The methods of measurement and the design of the cryostat used for the research are also presented.

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Tests of the Stability of Chinese RhFe Resistance Thermometers at Low Temperatures

Int J Thermophys Tests of the Stability of Chinese RhFe Resistance Thermometers at Low Temperatures A. Kowal 0 1 H. Manuszkiewicz 0 1 B. Kołodziej 0 1 A. Szmyrka-Grzebyk 0 1 Peng Lin 0 1 Bo Gao 0 1 Lihong Yu 0 1 0 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing , People's Republic of China 1 Instytut Niskich Temperatur i Badan ́ Strukturalnych PAN , Wrocław , Poland Rhodium-iron resistance thermometers are recommended as precise thermometers at temperatures below 25 K. The thermometers were developed at the National Physical Laboratory and produced by H. Tinsley and Co Ltd almost 50 years ago. Later, they were made by other companies and institutes as well, but despite this, the availability of the thermometers decreased and a new source of supply was needed. Several years ago, the Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences, developed its own technology for making wire of Rh-0.5 at% Fe alloy which was used in the production of new thermometers. These devices have been tested previously at INRIM (Italy) and later at INTiBS (Poland). INTiBS has carried out an investigation focused on the thermometers' stability after thermal cycling treatment. This paper presents the results of stability tests of about 30 thermometers produced by TIPC in two batches. The resistance of each thermometer was measured at temperatures of about 4.6 K and 7.2 K before and after 10, 30 and 50 thermal cycles from room temperature. The methods of measurement and the design of the cryostat used for the research are also presented. Cryogenic thermometers; Resistance thermometers; Rhodium-iron thermometers; Thermometer stability 1 Introduction 2 Thermal Treatment 3 Cryostat Construction Fig. 1 Liquid helium cryostat construction (a heat switch, b copper block, c thermal shield, d carbon thermometer, e lead sample, f mutual induction coils) 4 RIRT Resistance Measurements 5 Tests of Thermometers Stability R = aT + b. Pb sample copper block thermometer reference resistor thermometer bridge temperature controller generator f=1900 Hz analog output voltage input Fig. 3 Measuring system Fig. 4 Method of estimation of RIRTs stability − T = 6 Measurements Results • standard error of regression (function R = aT + b), • uncertainty of determination of the self-heating corrections, • uncertainty of ratio bridge, • standard resistor thermal drift, • standard thermometer reproducibility. 0L13T 0L51T L106T 0L17T Thermometr number Fig. 10 Stability of second batch RIRTs in 4.6 K 0,2 after 10 cycles after 30 cycles after 50 cycles after 10 cycles after 30 cycles after 50 cycles L011T L013T L015T L016T Thermometr number Fig. 11 Stability of second batch RIRTs in 7.2 K 7 Summary 1. W.L. Tew , R.L. Rusby , P. Lin , L. Lipin´ski , P.P.M. Steur , B.W.A. Ricketson , Int . J. Thermophys. 36 , 2036 ( 2015 ) 2. R.L. Rusby, in Temperature, Its Measurements and Control in Science and Industry, Part 2, ed. by H.H. Plumb (ISA, Pittsburgh, 1972 ), p. 865 3. R.L. Rusby, in Temperature, Its Measurements and Control in Science and Industry, Part 1, ed. by J.F. Schooley (AIP, New York, 1982 ), p. 829 4. L.M. Besley , P. Lin , Meas. Sci. Technol . 4 , 1357 ( 1993 ) 5. G.A. Kytin , S.F. Vorfolomeev , Y.A. Dedikov , L.N. Ermilova , D.N. Astrov , in Proceedings of the 17th Meeting of the CCT, Document 89-7 (BIPM, Sevres , 1989 ) 6. O. Tamura , H. Sakurai , Jpn . J. Appl. Phys . 26 , L947 ( 1987 ) 7. P. Lin , Acta Metrol . Sin. 29 , 171 ( 2008 ) 8. P. Lin , X. Li , B. Gao , L. Yu , R. Huang , F. Li , Development of Chinese standard type of rhodium-iron resistance thermometers , in Presented on XIII International Symposium on Temperature and Thermal measurements in Industry and Science TEMPMEKO 2016 , Zakopane ( 2016 ) 9. F. Pavese , A. Szmyrka-Grzebyk , L. Lipin´ski , H. Manuszkiewicz , P. Qiu , J.T. Zhang , P. Lin , X.W. Li , Int . J. Thermophys. 29 , 51 ( 2008 ) 10. L. Lipin´ski, A. Szmyrka-Grzebyk , P. Lin , X.W. Li , H. Manuszkiewicz , D. Jancewicz , A. Grykalowska , P.P.M. Steur , F. Pavese , Int . J. Thermophys. 31 , 1696 ( 2010 ) 11. V. Batagelj , J. Bojkovski , Int . J. Thermophys. 32 , 1409 - 1417 ( 2011 )


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A. Kowal, H. Manuszkiewicz, B. Kołodziej, A. Szmyrka-Grzebyk, Peng Lin, Bo Gao, Lihong Yu. Tests of the Stability of Chinese RhFe Resistance Thermometers at Low Temperatures, International Journal of Thermophysics, 2017, 95, DOI: 10.1007/s10765-017-2232-8