The use of industrial-grade platinum resistance thermometers between 77 K and 273 K

✍ Scribed by L.M. Besley; R.C. Kemp

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 298 KB
• Volume: 23
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(83)90136-4

✦ Synopsis

The stability and interpolation characteristics of some industrial-grade platinum resistance thermometers have been investigated between 77 K and 273 K. Seven sensors were thermally cycled many times between 77 K and 373 K and were found to suffer reversible changes in ice-point resistance. After some tens of cycles between 77 K and 273 K the ice-point resistances of the thermometers stabilised to within a few milliohms, provided that the thermometers were not heated above 300 K. A two-point calibration method for these thermometers is described. Using resistance values at the ice-point and the oxygen boiling point, a measurement accuracy of 35 mK can be obtained over the range 77 K to 273 K. Interpolation data for 27 thermometers are given.