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KazStandard Primary Dew/Frost Point Generator

Assylbek Zhumagali

Assylbek Zhumagali

  • Kazakhstan Institute of Standardization and MetrologyAstana, Kazakhstan
  • Tomsk Polytechnic UniversityTomsk, Russia
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Zhumagali, Assylbek
, 
Temirbolat Akimzhanov

Temirbolat Akimzhanov

S. Seifullin Kazakh Agro Technical Research UniversityAstana, Kazakhstan
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Akimzhanov, Temirbolat
, 
Raiymbek Zhumagali

Raiymbek Zhumagali

NIU MIETZelenograd, Russia
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Zhumagali, Raiymbek
, 
Sultanbek Smagulov

Sultanbek Smagulov

  • Kazakhstan Institute of Standardization and MetrologyAstana, Kazakhstan
  • Tomsk Polytechnic UniversityTomsk, Russia
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Smagulov, Sultanbek
 e 
Bahytkul Baihozhaeva

Bahytkul Baihozhaeva

L.N. Gumilyov Eurasian National UniversityAstana, Kazakhstan
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Baihozhaeva, Bahytkul
  
31 lug 2025
KazStandard Primary Dew/Frost Point Generator's Cover Image
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Pubblicato online: 31 lug 2025
Pagine: 172 - 177
Ricevuto: 04 dic 2024
Accettato: 07 lug 2025
DOI: https://doi.org/10.2478/msr-2025-0021
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© 2025 Assylbek Zhumagali et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Diagram of the KazStandard humidity generator.
Diagram of the KazStandard humidity generator.

Fig. 2.

Drawing of a saturator with a heat exchanger.
Drawing of a saturator with a heat exchanger.

Fig. 3.

Switching to negative dew point temperature of −18 °C.
Switching to negative dew point temperature of −18 °C.

Fig. 4.

Temperature distribution according to the saturator design at a bath temperature of −20 °C.
Temperature distribution according to the saturator design at a bath temperature of −20 °C.

Fig. 5.

Dew point temperature stabilization.
Dew point temperature stabilization.

Fig. 6.

The difference in uncertainty between before and after the development of a humidity generator.
The difference in uncertainty between before and after the development of a humidity generator.

Fig. 7.

Dependence of the uncertainty of the generator on the volume of the saturator bath.
Dependence of the uncertainty of the generator on the volume of the saturator bath.

Uncertainty budget at −10 °C dew point temperature_

Source Value Distribution Divisor Sensitivity coefficient Standard uncertainty
Repeatability SPRT 0.001 Normal 1 1 0.001
SPRT calibration 0.003 Normal 2 1 0.0015
SPRT resolution (indicator unit) 0.001 Rectangular 3.46 1 0.000289
Bridge calibration 0.0001 Normal 2 2.6 0.00013
Bath stability 0.01 Rectangular 1.73 1 0.00578
Bath homogenity 0.01 Rectangular 1.73 1 0.00578
Saturator efficiency 0.106 Rectangular 1.73 1 0.06127
Dew-point hygrometer calibration 0.06 Normal 2 1 0.03
Resolution of hygrometer 0.01 Rectangular 3.46 1 0.00289
Combined uncertainty 0.069
Expanded uncertainty (k = 2) 0.14

Measurement results_

No. Saturation temperature t(SPRT) [°C] Measured value of the hygrometer t(CMH) [°C] Difference Δt = t(SPRT) –t(CMH) [°C] Extended uncertainty [°C]
1 −50.074 −49.63 −0.444 0.52
2 −40.077 −39.83 −0.247 0.29
3 −30.058 −29.96 −0.098 0.13
4 −20.025 −19.95 −0.075 0.11
5 −10.076 −9.97 −0.106 0.14
6 0.034 0.05 −0.016 0.06
7 10.006 9.92 0.086 0.12
8 20.008 19.91 0.098 0.13
Lingua:
Inglese
Frequenza di pubblicazione:
6 volte all'anno
Argomenti della rivista:
Ingegneria, Elettrotecnica, Ingegneria dell'automazione, metrologia e collaudo
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