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

Autor:	T. Gronych, J. Tesař, Martin Vičar, L. Peksa, Dominik Pražák
Rok vydání:	2015
Předmět:	chemistry.chemical_classification Leak Primary (chemistry) Hydrocarbon Traceability chemistry business.industry General Engineering Environmental science Process engineering business Metrology
Zdroj:	Metrologia. 52:R11-R21
ISSN:	1681-7575 0026-1394
DOI:	10.1088/0026-1394/52/4/r11
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a9231eb04b0547140936ce9181c9c648 https://doi.org/10.1088/0026-1394/52/4/r11 Zobrazit plný text záznamu