Realization of new definition of kelvin on National primary state standard of temperature in the temperature range from 0.3 K to 273.16 K GET 35-2021

Description and metrological characteristics are presented of upgraded in 2021 equipment of National primary state standard of temperature on the temperature range from 0.3 K to 273.16 K GET 35-2021. GET 35-2021 allow to to the reproduce and disseminate the unit of temperature according to its definition accepted on 26th CGPM in 2018. Three installations of acoustic gas thermometry developed in 2012–2019 have been introduced in the National primary state standard covering ranges 79–273.16 K, 4.2–80 K, 268.16–273.16 K. The equipment for reproduction of fixed points of of International Temperature scale ITS-90 has been upgraded for uncertainty reduction. Uncertainty of reproduction of thermodynamic temperature and temperature according to ITS-90 have been calculated on the basis of investigations of upgraded equipment.

Download Full-text

Overview of measurements capabilities in radiation thermometry at CEM (Spain)

19th International Congress of Metrology (CIM2019) ◽

10.1051/metrology/201918001 ◽

2019 ◽

Author(s):

M. J. Martin ◽

J. M. Mantilla ◽

D. del Campo

Keyword(s):

Fixed Point ◽

Fixed Points ◽

Temperature Scale ◽

Radiation Thermometry ◽

Thermodynamic Temperature ◽

National Standards ◽

Primary Radiation ◽

International Temperature Scale ◽

Definition Of The Kelvin ◽

Definition Of

CEM (Spanish National Institute of Metrology) is responsible for the maintenance and dissemination of the temperature national standards. Nowadays, the CEM Radiation Thermometry Laboratory disseminates and maintains the International Temperature Scale of 1990 (ITS-90) from the Ag fixed point (961.78 °C) to 2800 °C, using Ag or Cu fixed points as reference and standard radiation thermometers (RTs) working at a wavelength of 650 nm. CEM is also able to provide traceability to the new definition of the kelvin and to perform measurements of thermodynamic temperature from 400°C to 2800°C with different RTs (wavelengths of 650 nm, 900 nm and 1550 nm) using absolute and relative primary radiation thermometry. In addition the Radiation Thermometry laboratory performs calibration of RTs working in the usual infrared ranges (1 μm and 10 μm) from – 40°C to 1600°C.

Download Full-text

Primary state standard for the unit of temperature in the range of 13.81?273.15 K

Measurement Techniques ◽

10.1007/bf00815697 ◽

1973 ◽

Vol 16 (4) ◽

pp. 477-482 ◽

Cited By ~ 1

Author(s):

M. P. Orlova ◽

D. N. Astrov ◽

D. I. Sharevskaya ◽

L. B. Belyanskii ◽

Ya. E. Razhba ◽

...

Keyword(s):

State Standard ◽

Primary State ◽

Primary State Standard ◽

Unit Of Temperature

Download Full-text

Primary state standard of the unit of temperature, the kelvin, in the range of 273.15?2800 K

Measurement Techniques ◽

10.1007/bf00815698 ◽

1973 ◽

Vol 16 (4) ◽

pp. 483-486

Author(s):

I. I. Kirenkov ◽

A. Kh. Fayans ◽

G. A. Krakhmal'nikova

Keyword(s):

State Standard ◽

Primary State ◽

Primary State Standard ◽

Unit Of Temperature

Download Full-text

Primary state standard of magnetic flux (E)

Measurement Techniques ◽

10.1007/bf01105721 ◽

1972 ◽

Vol 15 (2) ◽

pp. 183-184

Author(s):

V. A. Karavaeva ◽

N. V. Studentsov ◽

V. N. Khorev

Keyword(s):

Magnetic Flux ◽

State Standard ◽

Primary State ◽

Primary State Standard

Download Full-text

Primary state standard of light intensity

Measurement Techniques ◽

10.1007/bf00821710 ◽

1977 ◽

Vol 20 (11) ◽

pp. 1659-1659

Keyword(s):

Light Intensity ◽

State Standard ◽

Primary State ◽

Primary State Standard

Download Full-text

LONG-TERM STABILITY OF Co-C AND Pd-C EUTECTIC FIXED POINTS FOR THERMOCOUPLES CALIBRATION

Measuring Equipment and Metrology ◽

10.23939/istcmtm2021.01.026 ◽

2021 ◽

Vol 82 (1) ◽

pp. 26-29

Author(s):

Yasser A. Abdelaziz ◽

◽

F.M. Megahed ◽

M. M. Abdel-Aal ◽

◽

...

Keyword(s):

Fixed Point ◽

Fixed Points ◽

Temperature Scale ◽

Term Stability ◽

Long Term Stability ◽

International Temperature Scale ◽

Definition Of The Kelvin ◽

Definition Of ◽

Eutectic Fixed Points

Eutectic fixed points are close to becoming a reference for high temperatures calibration, especially as the new International Temperature Scale (ITS) approach to issue after the re-definition of the Kelvin unit. In this work the long-term stability of Co-C and Pd-C eutectic fixed points were investigated using NIS-Egypt facilities. The eutectic points were measured using Pt/Pd thermocouple. The total exposure to the Co-C and Pd-C melting temperature was about 200 h for the fixed-point cell and 150 h for the Pt/Pd thermocouple. The emfs of the thermocouple at the melting point were observed to drift by about 0.25 °C. Realization uncertainties were estimated to be ~ 0.446 ◦C for Co-C and ~0.742 for Pd-C (k = 2). Results show that Co-C and Pd-C eutectic cells can exhibit long term stability.

Download Full-text

The freezing point of zinc as a primary point of the International Temperature Scale

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1958.0179 ◽

1958 ◽

Vol 247 (1249) ◽

pp. 214-224 ◽

Cited By ~ 4

Keyword(s):

Temperature Scale ◽

Freezing Point ◽

Platinum Resistance ◽

International Temperature Scale ◽

International Temperature ◽

Platinum Resistance Thermometers ◽

Resistance Thermometers ◽

Accuracy Of Measurement ◽

Definition Of ◽

Freezing Point Of Zinc

The technique is described of achieving the highest accuracy of measurement with platinum-resistance thermometers at the freezing point of zinc and the boiling point of sulphur. The two points are compared in a series of measurements and it is found that the zinc point is some three or four times more reproducible than the sulphur point. It is concluded that the substitution of the zinc point for the sulphur point as a primary fixed point of the International Temperature Scale would lead to a greater precision in the definition of the scale. The value of the freezing point of zinc is found to be 419∙5055 ± 0∙002°C.

Download Full-text