Abstract

The argon triple point is a required reference point for calibration of standard platinum resistance thermometers (SPRTs) on the International Temperature Scale of 1990 (ITS‐90) for use in all four subranges extending below the triple point of mercury. Availability of affordable, commercially produced apparatus to realize the triple point of argon has been very limited. A portable apparatus, integrated with an interactive microprocessor control, liquid‐nitrogen cooling and a sealed argon cell containing approximately 1.8 mol of high purity argon is described. Operating procedures for use of the apparatus, developed with input from personnel at the National Institute for Standards and Technology (NIST), are presented. Following these procedures, measurements of multiple plateaus realized by the apparatus (made using the NIST argon reference SPRT and measurement system) show agreement with the NIST apparatus realization within ±0.1 mK.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.