Perspectives of atmospheric reference leaks calibration by gravimetric method

Pražák, Dominik; Zůda, Jaroslav; Tesař, Jiří; Peksa, L.; Vičar, Martin

doi:10.1016/j.measurement.2012.08.021

Cited by 5 publications

(4 citation statements)

References 4 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If we compare the initial atmospheric weighing with the work in the special closable box, the solution is beneficial mainly for secondary standard freon leaks of large values, which usually have a bulky structure. However, it is necessary to realize that this solution was intended especially for them, since there exists a better solution for small and compact leaks: a Mettler Toledo mass comparator; see [29,30].…”

Section: Discussionmentioning

confidence: 99%

Gravimetric flow standard in the vacuum and hermetic modes

Vičar

Krajicek

Pražák

et al. 2018

Meas. Sci. Technol.

View full text Add to dashboard Cite

The Czech national standard of low gas flow is based on the dynamic gravimetry principle, defining the flow rate as the mass loss of gas from a pressure bottle which is continuously weighed. This weighing is performed in ambient atmosphere, which brings two problems. First, the buoyancy corrections are the main and unavoidable source of uncertainty. Second, condensation of the water vapor on the pressure bottle can occur, due to its cooling below dew point at higher flow rates. A weighing carried out in a hermetically closed atmosphere suppresses the problematic buoyancy effects. A weighing in a vacuum does the same, and also eliminates any danger of water condensation. The paper describes the hermetic and vacuum mode modifications together with the relevant uncertainty analyses.

show abstract

Section: Discussionmentioning

confidence: 99%

Gravimetric flow standard in the vacuum and hermetic modes

Vičar

Krajicek

Pražák

et al. 2018

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The authors [20] placed a standard leak into a brass base in order to ensure its stability and, with the aid of fraction weights, adjusted the mass of this system to be as closely as possible to 1 kg. The difference of the mass of this system (comprising the standard leak, the base and the fraction weights) and an exact 1 kg standard weight of class E1 was monitored.…”

Section: Gravimetric Methodsmentioning

confidence: 99%

A survey of the principles for primary standards for atmospheric halogenated-hydrocarbon-leaks

et al. 2015

View full text Add to dashboard Cite

Albeit the utilization of halogenated hydrocarbons in new devices is suppressed gradually, due to the protection of environment, large amounts of them still remain in existing equipment. It is important for metrology to carry out proper leak measurements of these devices during their service life with traceability to high quality primary standards. Efficient methods have been developed for vacuum leaks (gas outflow into vacuum) but halogenated hydrocarbons leak out into the atmosphere under real conditions. The design of primary standards that meet this condition is considerably more difficult and they are still rather rare. This paper gives an insight into the principles used for these standards, which can be classified into two groups: methods sensitive to the gas species and methods insensitive to the gas species.

show abstract

“…Neglecting the air buoyancy correction during gravimetric leak calibration may lead to significant error if the standard leak density is far from the conventional 8 000 kg•m -3 or if important variations of the ambient conditions occur during the measurements [2]. In this work the standard leak has a nominal value of 5 g•yr -1 and weighs around 1 kg.…”

Section: Introductionmentioning

confidence: 97%

Monte Carlo Method Applied to Gravimetric Leak Calibration

Blanc¹,

Beaudoux²

2023

Proceedings of the 24th IMEKO TC3 Conference on Measurement of Force, Mass and Torque

View full text Add to dashboard Cite

The gravimetric method for standard leak calibration is already documented and has proven to be repeatable. However, neglecting the air buoyancy correction in some cases may lead to a significant increase of the uncertainty and a bias on the result. The aim of this work is to provide a method for atmospheric leaks calibration using simple mass comparisons and the Monte Carlo method in order to determine the associated uncertainty and check the validity of the GUM approach in specific cases. The main objectives are to provide a guideline on how to quickly and simply calibrate such equipment and take into account the air buoyancy correction despite the lack of knowledge about the standard leak density.

show abstract

Perspectives of atmospheric reference leaks calibration by gravimetric method

Cited by 5 publications

References 4 publications

Gravimetric flow standard in the vacuum and hermetic modes

Gravimetric flow standard in the vacuum and hermetic modes

A survey of the principles for primary standards for atmospheric halogenated-hydrocarbon-leaks

Monte Carlo Method Applied to Gravimetric Leak Calibration

Contact Info

Product

Resources

About