Record Display for the EPA National Library Catalog
RECORD NUMBER: 77 OF 124| Main Title | Simple Method for the Preparation of Standard Diluted Gas Mixtures in the Microgram/cu m to Milligram/m Range (Methode Simple pour la Preparation de Dilutions de Gas Etalon dans le Domaine du Microgram/cu m au Milligram/m). | |||||||||||
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| Author | Benarie, M. ; Bodin., D. ; | |||||||||||
| CORP Author | Environmental Protection Agency, Research Triangle Park, N.C. Translation Services Section. | |||||||||||
| Year Published | 1975 | |||||||||||
| Report Number | EPA-TR-75-135; | |||||||||||
| Stock Number | PB-252 742-T | |||||||||||
| Additional Subjects | Gases ; Standards ; Air pollution ; Laboratory equipment ; Translations ; France ; Design criteria ; Gas chromatography ; Concentration(Composition) ; Viscosity ; Volumetric analysis ; | |||||||||||
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| Collation | 10p | |||||||||||
| Abstract | A device for producing standard diluted gas mixtures in which the constant flow rate is maintained by gaseous viscosity is described. The driving pressure difference is derived from a frictionless mercury ring piston. The device represents a volumetric primary standard. At the same time, it is also a secondary standard, as the flow rate is known by reference to well-known constants: gas viscosity, cubic dilation constant of mercury, and mass and length measurements. The apparatus is distinguished by its very simple design and relative insensitivity to temperature variations. |